PSLE The ratio of the number of shirts to that of blazers in a boutique was 3 : 1 at first. After 12 blazers were sold, the ratio of the number of shirts to that of blazers became 7 : 1. What was the total number of shirts and blazers in the boutique at first?
|
Shirts |
Blazers |
Total |
Before |
3x7 = 21 u |
1x7 = 7 u |
28 u |
Change |
|
- 12 |
|
After |
7x3 = 21 u |
1x3 = 3 u |
24 u |
The number of shirts remains unchanged.
Make the number of shirts the same.
LCM of 1 and 3 is 21.
Number of blazers sold
= 7 u - 3 u
= 4 u
1 u = 12 ÷ 4 = 3
Total number of shirts and blazers at first
= 21 u + 7 u
= 28 u
= 28 x 3
= 84
Answer(s): 84