Michael's school organized a trip to Thailand. At first, the ratio of the number of girls to the number of boys who planned to participate in the trip was 8 : 7. On the day of registration, 130 boys decided to withdraw and 130 more girls decided to join in. In the end, the number of boys who participated became 25% of the total children for the trip. How many less boys than girls would visit Thailand in the end?

	Girls	Boys	Total
Before	8x4 = 32 u	7x4 = 28 u	15x4 = 60 u
Change	+ 13 u	- 13 u
After	3x15 = 45 u	1x15 = 15 u	4x15 = 60 u

25% = ²⁵₁₀₀ = ¹₄

Since 130 boys withdrew and another 130 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 15 and 4 is 60.

Number of boys who decided to withdraw
= 28 u - 15 u
= 13 u

13 u = 130

1 u = 130 ÷ 13 = 10

Number of less boys than girls in the end
= 45 u - 15 u
= 30 u
= 30 x 10
= 300

Answer(s): 300