PSLE The ratio of the number of blouses to that of windbreakers in a factory outlet was 10 : 9 in the end. After 91 windbreakers were sold, the ratio of the number of blouses to that of windbreakers became 7 : 5. What was the total number of blouses and windbreakers in the factory outlet in the end?
|
Blouses |
Windbreakers |
Total |
Before |
10x7 = 70 u |
9x7 = 63 u |
133 u |
Change |
|
- 91 |
|
After |
7x10 = 70 u |
5x10 = 50 u |
120 u |
The number of blouses remains unchanged. Make the number of blouses the same.
LCM of 7 and 10 is 70.
Number of windbreakers sold
= 63 u - 50 u
= 13 u
1 u = 91 ÷ 13 = 7
Total number of blouses and windbreakers in the end
= 70 u + 50 u
= 120 u
= 120 x 7
= 840
Answer(s): 840