Ryan's school organized a trip to Peru. 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, 88 girls decided to withdraw and 88 more boys decided to join in. In the end, the number of girls who participated became 10% of the total children for the trip. How many more boys than girls would visit Peru in the end?
|
Boys |
Girls |
Total |
Before |
8x2 = 16 u |
7x2 = 14 u |
15x2 = 30 u |
Change |
+ 11 u |
- 11 u |
|
After |
9x3 = 27 u |
1x3 = 3 u |
10x3 = 30 u |
10% =
10100 =
110Since 88 girls withdrew and another 88 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 10 is 30.
Number of girls who decided to withdraw
= 14 u - 3 u
= 11 u
11 u = 88
1 u = 88 ÷ 11 = 8
Number of more boys than girls in the end
= 27 u - 3 u
= 24 u
= 24 x 8
= 192
Answer(s): 192