Levi's school organized a trip to Kenya. At first, the ratio of the number of girls to the number of boys who planned to participate in the trip was 7 : 5. On the day of registration, 16 boys decided to withdraw and 16 more girls decided to join in. In the end, the number of boys who participated became 35% of the total children for the trip. How many more girls than boys would visit Kenya in the end?

	Girls	Boys	Total
Before	7x5 = 35 u	5x5 = 25 u	12x5 = 60 u
Change	+ 4 u	- 4 u
After	13x3 = 39 u	7x3 = 21 u	20x3 = 60 u

35% = ³⁵₁₀₀ = ⁷₂₀

Since 16 boys withdrew and another 16 girls joined, the total number of children  at first and in the end remains unchanged. Make the total number of children the same. LCM of 12 and 20 is 60.

Number of boys who decided to withdraw
= 25 u - 21 u
= 4 u

4 u = 16

1 u = 16 ÷ 4 = 4

Number of more girls than boys in the end
= 39 u - 21 u
= 18 u
= 18 x 4
= 72

Answer(s): 72