Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

.

#7543. The average weight of 5 students of class II is 30 kilograms and the average weight of 4 students of class III is 35 kilograms. What is the average weight of all the 9 students?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7544. If the average marks of three batches of 55, 60, and 45 students respectively are 50, 55, and 60, then find the average marks of all the students.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

.

#7545. The average income of P, Q, R, S, and T is $15000. The average income of P and Q is $12000 and the average income of R and S is $16000. Find the average income of T.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

.

Neat work, Monox D. I-Fly! The solution #7545 is correct!

#7546. The sum of five numbers is 555. The average of first two numbers numbers is 75 and the third number is 115. What is the average of last two numbers?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

The solution #7546 is correct. Neat work, Monox D. I-Fly!

#7547. The average of five consecutive odd numbers is 7. What is the middle number if they are arranged in descending order?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7548. The average of four consecutive odd numbers is 12. Which is the lowest odd number?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7549. If the weights of A, B, and C are 55 kilograms, 60 kilograms, and 62 kilograms, find the average weight.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

.

The solution #7549 is correct. Good work!

#7550. Of three numbers, the average of the first and the second is greater than the average of the second and the third. What is the difference between the first and the third of the three numbers?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

.

#7551. The average of five numbers is 306.4. The average of the first first two numbers is 431 and the average of the last two numbers is 214.5. What is the third number?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

The solution #7551 is correct. Neat work!

#7552. The average age of a man and his son is 48 years. The ratio of their ages is 11 : 5 respectively. What will be the ratio of their ages after 6 years?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

The solution #7552 is correct. Neat work!

#7553. The average age of 80 girls was 20 years, the average age of 20 of them was 22 years and that of another 20 was 24 years. Find the average age of the remaining girls.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

Good attempt!

#7554. In a family, the average age of father and mother is 38 years whereas the average age of father, mother, and their only daughter is 28 years. Find the age of the daughter.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,936

May his adventurous soul rest in peace at heaven.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

The solution #7554 is correct! Neat work!

#7555. The average age of 30 boys in a class is 15 years. One boy aged 20 years left the class, but two new boys came in his place whose ages differ by 5 years. If the average age of all the boys now in the class still remains 15 years, find the age of the younger newcomer.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7556. In a class, there are 40 boys and their average age is 16 years. One boy, aged 17 years, leaving the class and another joining, the average age becomes 15.875 years. Find the age of the new boy.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7557. The average number of toffees with 6 friends is 10. If each of them eats one toffee, then find the average number of toffees with them, now.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7558. The salary of five members of a family is $10,000, $12,000, $17,000, $15,000, and $14,000. Find the average salary of all the members of the family using assumed mean.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7559. Out of seven given numbers, the average of the first four numbers is 4 and that of the last four numbers is also 4. If the average of all the seven numbers is 3, find the fourth number.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 29,221

Hi,

#7660. The average age of a man and his son is 35 years. The ratio of their ages is 5 : 2 respectively. What is the son's age?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline