PSLE The ratio of the number of blazers to that of windbreakers in a shop was 5 : 4 at first. After 6 windbreakers were sold, the ratio of the number of blazers to that of windbreakers became 2 : 1. What was the total number of blazers and windbreakers in the shop at first?
|
Blazers |
Windbreakers |
Total |
Before |
5x2 = 10 u |
4x2 = 8 u |
18 u |
Change |
|
- 6 |
|
After |
2x5 = 10 u |
1x5 = 5 u |
15 u |
The number of blazers remains unchanged.
Make the number of blazers the same.
LCM of 4 and 5 is 10.
Number of windbreakers sold
= 8 u - 5 u
= 3 u
1 u = 6 ÷ 3 = 2
Total number of blazers and windbreakers at first
= 10 u + 8 u
= 18 u
= 18 x 2
= 36
Answer(s): 36