PSLE The ratio of the number of shirts to that of blouses in a boutique was 7 : 4 at first. After 91 blouses were sold, the ratio of the number of shirts to that of blouses became 5 : 1. What was the total number of shirts and blouses in the boutique at first?
|
Shirts |
Blouses |
Total |
Before |
7x5 = 35 u |
4x5 = 20 u |
55 u |
Change |
|
- 91 |
|
After |
5x7 = 35 u |
1x7 = 7 u |
42 u |
The number of shirts remains unchanged. Make the number of shirts the same.
LCM of 5 and 7 is 35.
Number of blouses sold
= 20 u - 7 u
= 13 u
1 u = 91 ÷ 13 = 7
Total number of shirts and blouses at first
= 35 u + 20 u
= 55 u
= 55 x 7
= 385
Answer(s): 385