Risa bought five times as many tarts as Luis. After Risa ate 4 tarts, she had 12 more tarts than Luis. How many tarts did they buy altogether?
| |
Risa |
Luis |
Total |
| Before |
5 u |
1 u |
6 u |
| Change |
- 4 |
|
|
| After |
5 u - 4 |
1 u |
|
The number of tarts that Luis had remains unchanged.
If Luis had another 12 tarts in the end, the number of tarts that Risa and Luis had would be the same.
5 u - 4 = 1 u + 12
5 u - 1 u = 12 + 4
4 u = 16
1 u = 16 ÷ 4 = 4
Total number of tarts
= 5 u + 1 u
= 6 u
= 6 x 4
= 24
Answer(s): 24
