PSLE The ratio of the number of jackets to that of blazers in a factory outlet was 9 : 5 at first. After 102 blazers were sold, the ratio of the number of jackets to that of blazers became 7 : 2. What was the total number of jackets and blazers in the factory outlet at first?
|
Jackets |
Blazers |
Total |
Before |
9x7 = 63 u |
5x7 = 35 u |
98 u |
Change |
|
- 102 |
|
After |
7x9 = 63 u |
2x9 = 18 u |
81 u |
The number of jackets remains unchanged. Make the number of jackets the same.
LCM of 7 and 9 is 63.
Number of blazers sold
= 35 u - 18 u
= 17 u
1 u = 102 ÷ 17 = 6
Total number of jackets and blazers at first
= 63 u + 35 u
= 98 u
= 98 x 6
= 588
Answer(s): 588