¹₉ of the visitors at a bird park were men. 70% of the remaining visitors were women and the rest were children. The number of women was 154 more than the total number of men and children. After some women left the bird park, 50% of the visitors that remained were women. How many women left the bird park?

Men	Children	Women	Total
1x5	8x5		9x5
	3x4	7x4
5	12	28	45

	Men and children	Women
Before	17x1 = 17 u	28x1 = 28 u
Change		- 11 u
After	1x17 = 17 u	1x17 = 17 u

70% = ⁷⁰₁₀₀ = ⁷₁₀
Children : Women = 3 : 7

The total number of children and women at first is repeated.  Make the total number of children at first the same. LCM of 8 and 10 is 40.

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 17 and 1 is 17.

The number of women was 154 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
= 28 u - 17 u
= 11 u

11 u = 154

1 u = 154 ÷ 11 = 14

Number of women who left the bird park
= 28 u - 17 u
= 11 u
= 11 x 14
= 154

Answer(s): 154