PSLE The ratio of the number of windbreakers to that of jumpsuits in a shop was 7 : 4 in the end. After 35 jumpsuits were sold, the ratio of the number of windbreakers to that of jumpsuits became 3 : 1. What was the total number of windbreakers and jumpsuits in the shop in the end?
|
Windbreakers |
Jumpsuits |
Total |
Before |
7x3 = 21 u |
4x3 = 12 u |
33 u |
Change |
|
- 35 |
|
After |
3x7 = 21 u |
1x7 = 7 u |
28 u |
The number of windbreakers remains unchanged.
Make the number of windbreakers the same.
LCM of 4 and 7 is 21.
Number of jumpsuits sold
= 12 u - 7 u
= 5 u
1 u = 35 ÷ 5 = 7
Total number of windbreakers and jumpsuits in the end
= 21 u + 7 u
= 28 u
= 28 x 7
= 196
Answer(s): 196