PSLE The ratio of the number of coats to that of jumpsuits in a boutique was 3 : 2 at first. After 76 jumpsuits were sold, the ratio of the number of coats to that of jumpsuits became 11 : 1. What was the total number of coats and jumpsuits in the boutique at first?
|
Coats |
Jumpsuits |
Total |
Before |
3x11 = 33 u |
2x11 = 22 u |
55 u |
Change |
|
- 76 |
|
After |
11x3 = 33 u |
1x3 = 3 u |
36 u |
The number of coats remains unchanged. Make the number of coats the same.
LCM of 11 and 3 is 33.
Number of jumpsuits sold
= 22 u - 3 u
= 19 u
1 u = 76 ÷ 19 = 4
Total number of coats and jumpsuits at first
= 33 u + 22 u
= 55 u
= 55 x 4
= 220
Answer(s): 220