There were 154 children enrolled in the Julie Computer School in 2023. ³₁₁ of the children were boys. Additional children joined the computer school in 2024. For every 3 boys who joined the computer school, 2 girls joined the computer school. If there was an equal number of girls and boys in 2024, how many girls joined the school in that year?

	Boys	Girls
Before	42	112
Change	+ 3 u	+ 2 u
After	42 + 3 u	112 + 2 u

Fraction of children who are girls
= 1 - ³₁₁
= ⁸₁₁

Number of boys at first
= ³₁₁ x 154
= 42

Number of girls at first
= ⁸₁₁ x 154
= 112

Boys who joined : Girls who joined
3 : 2

The number of girls and boys in the end is the same.

42 + 3 u = 112 + 2 u
3 u - 2 u = 112 - 42

1 u = 70

Number of girls who joined the school in that year
= 2 u
= 2 x 70
= 140

Answer(s): 140