PSLE The ratio of the number of jackets to that of dresses in a factory outlet was 11 : 9 in the end. After 42 dresses were sold, the ratio of the number of jackets to that of dresses became 2 : 1. What was the total number of jackets and dresses in the factory outlet in the end?
|
Jackets |
Dresses |
Total |
Before |
11x2 = 22 u |
9x2 = 18 u |
40 u |
Change |
|
- 42 |
|
After |
2x11 = 22 u |
1x11 = 11 u |
33 u |
The number of jackets remains unchanged. Make the number of jackets the same.
LCM of 2 and 11 is 22.
Number of dresses sold
= 18 u - 11 u
= 7 u
1 u = 42 ÷ 7 = 6
Total number of jackets and dresses in the end
= 22 u + 11 u
= 33 u
= 33 x 6
= 198
Answer(s): 198