In a tuckshop,
79 of the boys wore sweaters. After 122 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 |
7x9 =
63 u |
2x9 =
18 u |
| Change |
- 122 |
|
| After |
1x2 =
2 u |
9x2 =
18 u |
10% =
10100 =
110The number of boys who did not wear sweaters remains unchanged. LCM of 2 and 9 is 18.
Number of boys who wore sweaters and left
= 63 u - 2 u
= 61 u
61 u = 122
1 u = 122 ÷ 61 = 2
Number of boys who did not wear sweaters
= 18 u
= 18 x 2
= 36
Answer(s): 36
