PSLE The ratio of the number of coats to that of blazers in a shopping centre was 3 : 1 at first. After 8 blazers were sold, the ratio of the number of coats to that of blazers became 5 : 1. What was the total number of coats and blazers in the shopping centre at first?
|
Coats |
Blazers |
Total |
Before |
3x5 = 15 u |
1x5 = 5 u |
20 u |
Change |
|
- 8 |
|
After |
5x3 = 15 u |
1x3 = 3 u |
18 u |
The number of coats remains unchanged. Make the number of coats the same.
LCM of 5 and 3 is 15.
Number of blazers sold
= 5 u - 3 u
= 2 u
1 u = 8 ÷ 2 = 4
Total number of coats and blazers at first
= 15 u + 5 u
= 20 u
= 20 x 4
= 80
Answer(s): 80