PSLE The ratio of the number of sweaters to that of blouses in a factory outlet was 9 : 5 in the end. After 102 blouses were sold, the ratio of the number of sweaters to that of blouses became 7 : 2. What was the total number of sweaters and blouses in the factory outlet in the end?
|
Sweaters |
Blouses |
Total |
Before |
9x7 = 63 u |
5x7 = 35 u |
98 u |
Change |
|
- 102 |
|
After |
7x9 = 63 u |
2x9 = 18 u |
81 u |
The number of sweaters remains unchanged. Make the number of sweaters the same.
LCM of 7 and 9 is 63.
Number of blouses sold
= 35 u - 18 u
= 17 u
1 u = 102 ÷ 17 = 6
Total number of sweaters and blouses in the end
= 63 u + 18 u
= 81 u
= 81 x 6
= 486
Answer(s): 486