PSLE The ratio of the number of jackets to that of vests in a factory outlet was 11 : 8 in the end. After 12 vests were sold, the ratio of the number of jackets to that of vests became 3 : 2. What was the total number of jackets and vests in the factory outlet in the end?
|
Jackets |
Vests |
Total |
Before |
11x3 = 33 u |
8x3 = 24 u |
57 u |
Change |
|
- 12 |
|
After |
3x11 = 33 u |
2x11 = 22 u |
55 u |
The number of jackets remains unchanged. Make the number of jackets the same.
LCM of 3 and 11 is 33.
Number of vests sold
= 24 u - 22 u
= 2 u
1 u = 12 ÷ 2 = 6
Total number of jackets and vests in the end
= 33 u + 22 u
= 55 u
= 55 x 6
= 330
Answer(s): 330