PSLE The ratio of the number of jumpsuits to that of dresses in a shopping centre was 3 : 1 at first. After 40 dresses were sold, the ratio of the number of jumpsuits to that of dresses became 11 : 2. What was the total number of jumpsuits and dresses in the shopping centre at first?
|
Jumpsuits |
Dresses |
Total |
Before |
3x11 = 33 u |
1x11 = 11 u |
44 u |
Change |
|
- 40 |
|
After |
11x3 = 33 u |
2x3 = 6 u |
39 u |
The number of jumpsuits remains unchanged. Make the number of jumpsuits the same.
LCM of 11 and 3 is 33.
Number of dresses sold
= 11 u - 6 u
= 5 u
1 u = 40 ÷ 5 = 8
Total number of jumpsuits and dresses at first
= 33 u + 11 u
= 44 u
= 44 x 8
= 352
Answer(s): 352