There were 143 adults enrolled in the Lucy Dancing School in 2016. ⁴₁₁ of the adults were women. Additional adults joined the dancing school in 2017. For every 4 women who joined the dancing school, 3 men joined the dancing school. If there was an equal number of men and women in 2017, how many men joined the school in that year?

	Women	Men
Before	52	91
Change	+ 4 u	+ 3 u
After	52 + 4 u	91 + 3 u

Fraction of adults who are men
= 1 - ⁴₁₁
= ⁷₁₁

Number of women at first
= ⁴₁₁ x 143
= 52

Number of men at first
= ⁷₁₁ x 143
= 91

Women who joined : Men who joined
4 : 3

The number of men and women in the end is the same.

52 + 4 u = 91 + 3 u
4 u - 3 u = 91 - 52

1 u = 39

Number of men who joined the school in that year
= 3 u
= 3 x 39
= 117

Answer(s): 117