MCQs about ratio:

1:

If the ratio of boys to girls at a school picnic is 5:3, which of the following cannot be the number of children at the picnic?

A.  24

B.  40

C.   96

D.  150

E.   720

2:

If 2/3 of the workers in an office are nonsmokers, what is the ratio of smokers to nonsmokers?

A.  2:5

B.  1:2

C.   3:5

D.  2:3

E.   3:2

3:

What is the ratio of circumference of a circle to its radius?

A.  1

B.  π/2

C.   (π) ^½

D.   π

E.   2 π

Answer1:

If 5x and 3x are the number of boys and the number of girls, respectively, at the picnic, then the number of children present is 5x+3x=8x. Therefore, the number of children must be a multiple of 8. Only 150 is not divisible by 8.

Answer2:

Of every 3 workers, 2 are nonsmokers, and 1 is a smoker. Then, the ratio of smokers to non-smokers is 1:2

Answer3:

As π is the ratio of circumference to the diameter of a circle, so

π=  c/d=  c/2r

2π= c/r

E