In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
girls = 20
girls percentage = 30%
boys = ?
Step 02:
total students = x
20 girls ---------- 30 %
x ---------- 100%
30 * x = 20 * 100
x = 2000 / 30
x = 66.6
boys = 66.6 - 20 = 46.6
boys = 47
The answer is:
There are 47 boys. .
