¹₁₀ of the people at a safari park were men. 90% of the remaining people were women and the rest were children. The number of women was 1240 more than the total number of men and children. After some women left the safari park, 50% of the people that remained were women. How many women left the safari park?

Men	Children	Women	Total
1x10	9x10		10x10
	1x9	9x9
10	9	81	100

	Men and children	Women
Before	19x1 = 19 u	81x1 = 81 u
Change		- 62 u
After	1x19 = 19 u	1x19 = 19 u

90% = ⁹⁰₁₀₀ = ⁹₁₀
Children : Women = 1 : 9

The total number of children and women at first is repeated.  Make the total number of children at first the same. LCM of 9 and 10 is 90.

50% = ⁵⁰₁₀₀ = ¹₂

When some women left, the total number of men and children remains unchanged. Make the total number of men and children the same. LCM of 19 and 1 is 19.

The number of women was 1240 more than the total number of men and children at first.

Number of more women than the total number of men and children at first
= 81 u - 19 u
= 62 u

62 u = 1240

1 u = 1240 ÷ 62 = 20

Number of women who left the safari park
= 81 u - 19 u
= 62 u
= 62 x 20
= 1240

Answer(s): 1240