Question

20% of all the children in a class are left handed.

4 children are left handed.
How many children are there in the class altogether?

Answer 1

There are 20 students in the class

Explanation:

Let the total number of children in the class be = x

from the question, we know that 20% of all the children are left-handed. We also know that 20% of the total children in the class = 4.

This means that 20% of x = 4

Wherever we see the word "of" in an arithmetic problem, we should know that it infers a multiplication there.

Hence, we have

`(20)/(100) * x = 4`

`x = (4 * 100)/(20)= 20`

There are 20 children in the class altogether