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