PSLE The ratio of the number of windbreakers to that of blazers in a shop was 5 : 2 at first. After 12 blazers were sold, the ratio of the number of windbreakers to that of blazers became 4 : 1. What was the total number of windbreakers and blazers in the shop at first?
|
Windbreakers |
Blazers |
Total |
Before |
5x4 = 20 u |
2x4 = 8 u |
28 u |
Change |
|
- 12 |
|
After |
4x5 = 20 u |
1x5 = 5 u |
25 u |
The number of windbreakers remains unchanged.
Make the number of windbreakers the same.
LCM of 2 and 5 is 20.
Number of blazers sold
= 8 u - 5 u
= 3 u
1 u = 12 ÷ 3 = 4
Total number of windbreakers and blazers at first
= 20 u + 8 u
= 28 u
= 28 x 4
= 112
Answer(s): 112