Math Is Fun Forum

balasvce

Member

Registered: 2006-12-20

Posts: 37

hi solutions please

hi guys ;
can yu plzz help me solve these questions,
thanx in advance

*In a certain history class, all except 23 students scored

under 85 on a test. If 18 students scored over 85 on this

test, how many students are there in this history class?
(A) 33
(B) 37
(C) 39
(D) 41
(E) it cannot be determined from the information given

* john has 4 ties, 12 shirts, and 3 belts. if each day he

wears exactly 1 tie, 1 shirt, and 1 belt, what is the maximum

number of days he can go without repeating a particular

combination ?
(A) 12
(B) 21
(C) 84
(D) 108
(E) 144

*john has 4 ties, 12 shirts, and 3 belts. if each day he

wears exactly 1 tie, 1 shirt, and 1 belt, what is the maximum

number of days he can go with repeating
combinations ?

balasvce

Member

Registered: 2006-12-20

Posts: 37

Re: hi solutions please

11) set A contains multiple of 6 n set b contains multiples of

8. No. of multiplies in set C which has common multiplies of A

and B.

LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: hi solutions please

hi guys ;
can yu plzz help me solve these questions,
thanx in advance

*In a certain history class, all except 23 students scored

under 85 on a test. If 18 students scored over 85 on this

test, how many students are there in this history class?
(A) 33
(B) 37
(C) 39
(D) 41
(E) it cannot be determined from the information given since you don't know how many that scored 85.

* john has 4 ties, 12 shirts, and 3 belts. if each day he

wears exactly 1 tie, 1 shirt, and 1 belt, what is the maximum

number of days he can go without repeating a particular

combination ?
(A) 12
(B) 21
(C) 84
(D) 108
(E) 144 since the combinations is a 3D matrix with length, height and width; 4 ties, 12 shirts, and 3 belts, hence 4*12*3 = 144

*john has 4 ties, 12 shirts, and 3 belts. if each day he

wears exactly 1 tie, 1 shirt, and 1 belt, what is the maximum

number of days he can go with repeating
combinations ?
Until the clothes are unwareable.

Last edited by LQ (2006-12-21 02:19:08)

---

I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: hi solutions please

The answer to the first question is E, but for a different reason to what LQ has said.

If all except 23 students scored under 85 on the test, then that means that 23 students scored 85 or over. We are also told that 18 students scored over 85, which means that we can infer that 5 students scored 85 exactly, but we don't know how many scored less than 85.

Could you explain the last question in a bit more detail please?

---

Why did the vector cross the road?
It wanted to be normal.

LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: hi solutions please

Yeah, you're right. It's E, anyway.

---

I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...