PSLE The ratio of the number of blouses to that of jumpsuits in a shop was 10 : 9 at first. After 65 jumpsuits were sold, the ratio of the number of blouses to that of jumpsuits became 7 : 5. What was the total number of blouses and jumpsuits in the shop at first?
|
Blouses |
Jumpsuits |
Total |
Before |
10x7 = 70 u |
9x7 = 63 u |
133 u |
Change |
|
- 65 |
|
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 jumpsuits sold
= 63 u - 50 u
= 13 u
1 u = 65 ÷ 13 = 5
Total number of blouses and jumpsuits at first
= 70 u + 63 u
= 133 u
= 133 x 5
= 665
Answer(s): 665