There were twice as many girls as boys at a function. After 9 boys left the function, there were five times as many girls as boys who remained behind. How many girls were there at the function?
| |
Girls |
Boys |
| Before |
2x5 =
10 u |
1x5 =
5 u |
| Change |
|
- 9 |
| After |
5x2 =
10 u |
1x2 =
2 u |
The number of girls remained unchanged. Make the number of girls the same. LCM of 2 and 5 is 10.
Decrease in the number of boys
= 5 u - 2 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Number of girls
= 10 u
= 10 x 3
= 30
Answer(s): 30
