In a tuckshop,
56 of the boys wore sweaters. After 396 boys who wore sweaters left the tuckshop, the percentage of boys who wore sweaters decreased to 10%. How many boys in the tuckshop did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
5x9 = 45 u |
1x9 = 9 u |
Change |
- 396 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of boys who did not wear sweaters remains unchanged. LCM of 1 and 9 is 9.
Number of boys who wore sweaters and left
= 45 u - 1 u
= 44 u
44 u = 396
1 u = 396 ÷ 44 = 9
Number of boys who did not wear sweaters
= 9 u
= 9 x 9
= 81
Answer(s): 81