There were 297 adults enrolled in the Mary Computer School in 2019. ⁵₁₁ of the adults were women. Additional adults joined the computer school in 2020. For every 5 women who joined the computer school, 4 men joined the computer school. If there was an equal number of men and women in 2020, how many men joined the school in that year?

	Women	Men
Before	135	162
Change	+ 5 u	+ 4 u
After	135 + 5 u	162 + 4 u

Fraction of adults who are men
= 1 - ⁵₁₁
= ⁶₁₁

Number of women at first
= ⁵₁₁ x 297
= 135

Number of men at first
= ⁶₁₁ x 297
= 162

Women who joined : Men who joined
5 : 4

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

135 + 5 u = 162 + 4 u
5 u - 4 u = 162 - 135

1 u = 27

Number of men who joined the school in that year
= 4 u
= 4 x 27
= 108

Answer(s): 108