PSLE The ratio of the number of blouses to that of jackets in a boutique was 11 : 5 in the end. After 12 jackets were sold, the ratio of the number of blouses to that of jackets became 7 : 3. What was the total number of blouses and jackets in the boutique in the end?
|
Blouses |
Jackets |
Total |
Before |
11x7 = 77 u |
5x7 = 35 u |
112 u |
Change |
|
- 12 |
|
After |
7x11 = 77 u |
3x11 = 33 u |
110 u |
The number of blouses remains unchanged. Make the number of blouses the same.
LCM of 7 and 11 is 77.
Number of jackets sold
= 35 u - 33 u
= 2 u
1 u = 12 ÷ 2 = 6
Total number of blouses and jackets in the end
= 77 u + 33 u
= 110 u
= 110 x 6
= 660
Answer(s): 660