The number of boys in the parade square was
38 that of the girls. There were 210 more girls than boys. After some girls had left the parade square, the number of boys at the parade square was thrice the number of the remaining girls. How many girls left the parade square?
| |
Girls |
Boys |
Difference |
| Before |
8 u |
3 u |
5 u |
| Change |
- ? |
|
|
| After |
1 u |
3 u |
|
The number of boys at first and in the end remains unchanged.
Number of more girls than boys at first
= 8 u - 3 u
= 5 u
5 u = 210
1 u = 210 ÷ 5 = 42
Number of girls that left
= 8 u - 1 u
= 7 u
= 7 x 42
= 294
Answer(s): 294
