PSLE The ratio of the number of coats to that of shirts in a shopping centre was 11 : 4 in the end. After 70 shirts were sold, the ratio of the number of coats to that of shirts became 9 : 2. What was the total number of coats and shirts in the shopping centre in the end?
|
Coats |
Shirts |
Total |
Before |
11x9 = 99 u |
4x9 = 36 u |
135 u |
Change |
|
- 70 |
|
After |
9x11 = 99 u |
2x11 = 22 u |
121 u |
The number of coats remains unchanged.
Make the number of coats the same.
LCM of 4 and 11 is 99.
Number of shirts sold
= 36 u - 22 u
= 14 u
1 u = 70 ÷ 14 = 5
Total number of coats and shirts in the end
= 99 u + 22 u
= 121 u
= 121 x 5
= 605
Answer(s): 605