PSLE The ratio of the number of blazers to that of shirts in a factory outlet was 11 : 10 at first. After 100 shirts were sold, the ratio of the number of blazers to that of shirts became 8 : 5. What was the total number of blazers and shirts in the factory outlet at first?
|
Blazers |
Shirts |
Total |
Before |
11x8 = 88 u |
10x8 = 80 u |
168 u |
Change |
|
- 100 |
|
After |
8x11 = 88 u |
5x11 = 55 u |
143 u |
The number of blazers remains unchanged. Make the number of blazers the same.
LCM of 8 and 11 is 88.
Number of shirts sold
= 80 u - 55 u
= 25 u
1 u = 100 ÷ 25 = 4
Total number of blazers and shirts at first
= 88 u + 80 u
= 168 u
= 168 x 4
= 672
Answer(s): 672