PSLE The ratio of the number of jackets to that of shirts in a factory outlet was 7 : 3 at first. After 80 shirts were sold, the ratio of the number of jackets to that of shirts became 9 : 1. What was the total number of jackets and shirts in the factory outlet at first?
|
Jackets |
Shirts |
Total |
Before |
7x9 = 63 u |
3x9 = 27 u |
90 u |
Change |
|
- 80 |
|
After |
9x7 = 63 u |
1x7 = 7 u |
70 u |
The number of jackets remains unchanged. Make the number of jackets the same.
LCM of 9 and 7 is 63.
Number of shirts sold
= 27 u - 7 u
= 20 u
1 u = 80 ÷ 20 = 4
Total number of jackets and shirts at first
= 63 u + 27 u
= 90 u
= 90 x 4
= 360
Answer(s): 360