PSLE The ratio of the number of windbreakers to that of jackets in a shop was 11 : 7 at first. After 24 jackets were sold, the ratio of the number of windbreakers to that of jackets became 2 : 1. What was the total number of windbreakers and jackets in the shop at first?
|
Windbreakers |
Jackets |
Total |
Before |
11x2 = 22 u |
7x2 = 14 u |
36 u |
Change |
|
- 24 |
|
After |
2x11 = 22 u |
1x11 = 11 u |
33 u |
The number of windbreakers remains unchanged. Make the number of windbreakers the same.
LCM of 2 and 11 is 22.
Number of jackets sold
= 14 u - 11 u
= 3 u
1 u = 24 ÷ 3 = 8
Total number of windbreakers and jackets at first
= 22 u + 14 u
= 36 u
= 36 x 8
= 288
Answer(s): 288