There was an equal number of boys and girls in the school hall. When 10% of the girls left the school hall, there were 9 more boys than girls remaining in the school hall. How many children remained in the school hall?
|
|
Boys
|
Girls
|
|
Before
|
10 u
|
10 u
|
|
Change
|
|
- 1 u
|
|
After
|
10 u
|
9 u
|
10% =
10100 =
110Number of girls in the end
= 10 u - 1 u
= 9 u
Number of more boys than girls remaining in the school hall
= 10 u - 9 u
= 1 u
1 u = 9
Total number of students remaining in the school hall
= 10 u + 9 u
= 19 u
= 19 x 9
= 171
Answer(s): 171
