Henry's school organized a trip to Fiji. At first, the ratio of the number of boys to the number of girls who planned to participate in the trip was 8 : 7. On the day of registration, 130 girls decided to withdraw and 130 more boys decided to join in. In the end, the number of girls who participated became 25% of the total children for the trip. How many more boys than girls would visit Fiji in the end?
|
Boys |
Girls |
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 =
14Since 130 girls withdrew and another 130 boys 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 girls who decided to withdraw
= 28 u - 15 u
= 13 u
13 u = 130
1 u = 130 ÷ 13 = 10
Number of more boys than girls in the end
= 45 u - 15 u
= 30 u
= 30 x 10
= 300
Answer(s): 300