PSLE The ratio of the number of jumpsuits to that of blouses in a shop was 7 : 4 at first. After 27 blouses were sold, the ratio of the number of jumpsuits to that of blouses became 4 : 1. What was the total number of jumpsuits and blouses in the shop at first?
|
Jumpsuits |
Blouses |
Total |
Before |
7x4 = 28 u |
4x4 = 16 u |
44 u |
Change |
|
- 27 |
|
After |
4x7 = 28 u |
1x7 = 7 u |
35 u |
The number of jumpsuits remains unchanged. Make the number of jumpsuits the same.
LCM of 4 and 7 is 28.
Number of blouses sold
= 16 u - 7 u
= 9 u
1 u = 27 ÷ 9 = 3
Total number of jumpsuits and blouses at first
= 28 u + 16 u
= 44 u
= 44 x 3
= 132
Answer(s): 132