Question

n a class of 40 students 20% are girls. How many boys are there in the class?
a. 26
b. 28
c. 30
d. 32

Answer 1

Answer:d)32

there will be 32 boys

Answer 2

The number of boys in the class = 32 [ The correct option is d. 32 ]

Given :

In a class of 40 students 20% are girls

To find :

The number of boys in the class is

a. 26

b. 28

c. 30

d. 32

Solution :

Step 1 of 2 :

Calculate number of girls in the class

Total number of students in the class = 40

20% are girls

∴ Number of girls in the class

$\displaystyle \sf = 40 \times \frac{20}{100}$

$\displaystyle \sf = 40 \times \frac{1}{5}$

$\displaystyle \sf = 8$

Step 2 of 2 :

Calculate number of boys in the class

∴ The number of boys in the class

= Total number of students in the class - Number of girls in the class

= 40 - 8

= 32

Hence the correct option is d. 32

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