PSLE The ratio of the number of coats to that of jackets in a boutique was 5 : 2 in the end. After 18 jackets were sold, the ratio of the number of coats to that of jackets became 7 : 1. What was the total number of coats and jackets in the boutique in the end?
|
Coats |
Jackets |
Total |
Before |
5x7 = 35 u |
2x7 = 14 u |
49 u |
Change |
|
- 18 |
|
After |
7x5 = 35 u |
1x5 = 5 u |
40 u |
The number of coats remains unchanged.
Make the number of coats the same.
LCM of 2 and 5 is 35.
Number of jackets sold
= 14 u - 5 u
= 9 u
1 u = 18 ÷ 9 = 2
Total number of coats and jackets in the end
= 35 u + 5 u
= 40 u
= 40 x 2
= 80
Answer(s): 80