Question

In a classroom, there are 12 boys. If 40% are girls, how many students are in the class.

Answer 1

Answer:

20 students in the class

Step-by-step explanation:

given that 40% are girls , then

100% - 40% = 60% are boys.

let x be the number of girls in the class, then by proportion

$\frac{12}{60}$ = $\frac{x}{40}$ ( cross multiply )

60x = 12 × 40 = 480 ( divide both sides by 60 )

x = 8

There are 8 girls in the class

Total number of students = 12 + 8 = 20

Answer 2

Answer:

8 girls are in the class.