PSLE The ratio of the number of jackets to that of blouses in a shopping centre was 11 : 8 at first. After 138 blouses were sold, the ratio of the number of jackets to that of blouses became 7 : 3. What was the total number of jackets and blouses in the shopping centre at first?
|
Jackets |
Blouses |
Total |
Before |
11x7 = 77 u |
8x7 = 56 u |
133 u |
Change |
|
- 138 |
|
After |
7x11 = 77 u |
3x11 = 33 u |
110 u |
The number of jackets remains unchanged.
Make the number of jackets the same.
LCM of 8 and 11 is 77.
Number of blouses sold
= 56 u - 33 u
= 23 u
1 u = 138 ÷ 23 = 6
Total number of jackets and blouses at first
= 77 u + 56 u
= 133 u
= 133 x 6
= 798
Answer(s): 798