Question

The probability of being a girl in this class is 4/7 and there are 12 boys. Find the total number of students.

Answer 1

Answer: 28 students

Step-by-step explanation:

The probability of being a girl is 4/7 which means that the probability of being a boy is 3/7 as the fractions must add up to 1.

Assuming the number of people in class is x then the following expression can be used to solve for it;

$\frac{3}{7} x = 12\\\\3x = 12 * 7\\\\x = \frac{12 * 7 }{3} \\\\x = 28$