There was an equal number of boys and girls in the computer lab. When 20% of the girls left the computer lab, there were 10 more boys than girls remaining in the computer lab. How many children remained in the computer lab?
|
|
Boys
|
Girls
|
|
Before
|
5 u
|
5 u
|
|
Change
|
|
- 1 u
|
|
After
|
5 u
|
4 u
|
20% =
20100 =
15Number of girls in the end
= 5 u - 1 u
= 4 u
Number of more boys than girls remaining in the computer lab
= 5 u - 4 u
= 1 u
1 u = 10
Total number of students remaining in the computer lab
= 5 u + 4 u
= 9 u
= 9 x 10
= 90
Answer(s): 90
