10 second questions

Jai Ganesh · 2019-11-20 00:03:44

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?

Monox D. I-Fly · 2019-11-20 14:28:30

Jai Ganesh · 2019-11-20 15:07:18

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?

Monox D. I-Fly · 2019-11-20 20:02:22

Jai Ganesh · 2019-11-20 20:34:37

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.

Monox D. I-Fly · 2019-11-20 20:57:03

Jai Ganesh · 2019-11-21 00:11:10

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.

Monox D. I-Fly · 2019-11-21 15:34:29

Jai Ganesh · 2019-11-21 16:39:23

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.

Jai Ganesh · 2019-11-23 00:46:22

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.

Jai Ganesh · 2019-11-25 00:32:20

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.

Jai Ganesh · 2019-11-27 00:44:42

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.

Jai Ganesh · 2019-11-29 00:33:25

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.

Jai Ganesh · 2019-12-01 01:16:45

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?

Jai Ganesh · 2019-12-03 00:32:43

Hi,

#7661. The average salary of A, B, and C is $35000 per annum. Also, the average salary of D and E is $38000 per annum. What is the average salary per annum of all the five taken together?

Monox D. I-Fly · 2019-12-03 15:31:22

Jai Ganesh · 2019-12-03 16:34:25

Hi,

.

Neat work!

#7662. The average age of 8 persons is increased by 2 years when one of them, whose age is 24 years is replaced by a new person. Find the age of the new person.

Jai Ganesh · 2019-12-05 00:47:13

Hi,

#7663. The average of coins with a group of friends reduces by 1, when one friend having 20 coins leaves the group. Find the number of friends left in the group given that originally, average of coins was 15.

Jai Ganesh · 2019-12-07 00:09:47

Hi,

#7664. Find the average of squares of natural numbers up to 6.

Jai Ganesh · 2019-12-09 00:24:45

Hi,

#7665. Find the average of cubes of natural numbers up to 12.

Jai Ganesh · 2019-12-10 17:09:20

Hi,

#7666. The average weight of 3 group of friends of 50, 30, and 20 members respectively are 50 kilograms, 52 kilograms, and 55 kilograms. What is the average weight of all the friends taken together?

Monox D. I-Fly · 2019-12-10 20:04:44

Jai Ganesh · 2019-12-10 20:48:04

Hi,

Neat work!

#7667. The average of the age of A, B, and C is 25 years, while the average of the age of A, B, and D is 28 years. If D is 28 years old, then what is the age of C?

Jai Ganesh · 2019-12-11 13:52:40

Hi,

#7668. The average age of all employees of M/s XYZ is 35 years. It was later found that age of one of the employees has been taken as 10 years less than his actual age, so the new average after correction increased by 0.5 years. Find the number of employees of M/s XYZ.

Jai Ganesh · 2019-12-13 00:29:29

Hi,

#7669. The average of p, q, 13, and 21 is 16 and average of q, 5, 12, and 17 is 10. Find the value of pq.

Math Is Fun Forum

#8576 2019-11-20 00:03:44

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#8577 2019-11-20 14:28:30

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#8578 2019-11-20 15:07:18

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#8579 2019-11-20 20:02:22

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#8581 2019-11-20 20:57:03

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#8582 2019-11-21 00:11:10

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#8584 2019-11-21 16:39:23

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#8589 2019-12-01 01:16:45

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#8590 2019-12-03 00:32:43

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#8591 2019-12-03 15:31:22

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