Question

The strength of a class is 70 which of the following cannot be the ratio of the number of boys and girls in the class?
Select one:
a. 2:5
b. 11:3
c. 9:2
d. 3:2

Answer 1

Answer: c. 9:2

Explanation:

Strength of class = 70

Ratio of boys to girls is given

Number of students can never be decimal values.

Numbers of boys or girls need to be positive integers.

we have ratios as

a. 2:5

b. 11:3

c. 9:2

d. 3:2

Taking 2:5

2+5 = 7

70 is divisible by 7

Hence the ratio of boys and girls in the class can be 2:5

Taking 11:3

11+3 = 14

70 is divisible by14

Hence the ratio of boys and girls in the class can be 11:3

Taking 9:2

9+2 = 11

70 is divisible by 11

Hence the ratio of boys and girls in the class can not  be 9:2

Taking 3:2

3+2 = 5

70 is divisible by 5

Hence the ratio of boys and girls in the class can be 3:2

Answer = c. 9:2

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