Question

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

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Answer 1

Answer: 28 students

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;

`(3)/(7) x = 12\\\\3x = 12 * 7\\\\x = (12 * 7 )/(3) \\\\x = 28`