10% of the people are performers for a concert and the rest are spectators. 60% of the spectators are children and there are 540 more child spectators than parent spectators. How many child spectators must leave so that 8% of the people are child spectators?
|
Performers |
Spectators |
|
1x5 |
9x5 |
|
|
Parents |
Children |
|
|
2x9 |
3x9 |
Before |
5 u |
18 u |
27 u |
Change |
|
|
- ? |
After |
23x1 = 23 u |
2x1 = 2 u |
10% =
10100 =
110 60% =
60100 =
35 8% =
8100 =
225The total number of spectators at first is repeated. Make the total number of spectators the same. LCM of 9 and 5 is 45.
Number of more child spectators than parent spectators at first
= 27 u - 18 u
= 9 u
9 u = 540
1 u = 540 ÷ 9 = 60
If some child spectators leave, the total number of parent spectators and performers remains unchanged.
Number of child spectators who must leave so that 8% of the people are child spectators
= 27 u - 2 u
= 25 u
= 25 x 60
= 1500
Answer(s): 1500