PSLE The ratio of the number of windbreakers to that of blouses in a shopping centre was 11 : 7 at first. After 112 blouses were sold, the ratio of the number of windbreakers to that of blouses became 7 : 3. What was the total number of windbreakers and blouses in the shopping centre at first?
|
Windbreakers |
Blouses |
Total |
Before |
11x7 = 77 u |
7x7 = 49 u |
126 u |
Change |
|
- 112 |
|
After |
7x11 = 77 u |
3x11 = 33 u |
110 u |
The number of windbreakers remains unchanged. Make the number of windbreakers the same.
LCM of 7 and 11 is 77.
Number of blouses sold
= 49 u - 33 u
= 16 u
1 u = 112 ÷ 16 = 7
Total number of windbreakers and blouses at first
= 77 u + 49 u
= 126 u
= 126 x 7
= 882
Answer(s): 882