In a hall,
910 of the children wore sweaters. After 480 children who wore sweaters left the hall, the percentage of children who wore sweaters decreased to 10%. How many children in the hall did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
9x9 = 81 u |
1x9 = 9 u |
Change |
- 480 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of children who did not wear sweaters remains unchanged. LCM of 1 and 9 is 9.
Number of children who wore sweaters and left
= 81 u - 1 u
= 80 u
80 u = 480
1 u = 480 ÷ 80 = 6
Number of children who did not wear sweaters
= 9 u
= 9 x 6
= 54
Answer(s): 54