Lynn bought four times as many croissants as Billy. After Lynn ate 4 croissants, she had 8 more croissants than Billy. How many croissants did they buy altogether?
| |
Lynn |
Billy |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
- 4 |
|
|
| After |
4 u - 4 |
1 u |
|
The number of croissants that Billy had remains unchanged.
If Billy had another 8 croissants in the end, the number of croissants that Lynn and Billy had would be the same.
4 u - 4 = 1 u + 8
4 u - 1 u = 8 + 4
3 u = 12
1 u = 12 ÷ 3 = 4
Total number of croissants
= 4 u + 1 u
= 5 u
= 5 x 4
= 20
Answer(s): 20
