Betty bought four times as many croissants as Andy. After Betty ate 4 croissants, she had 11 more croissants than Andy. How many croissants did they buy altogether?
| |
Betty |
Andy |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
- 4 |
|
|
| After |
4 u - 4 |
1 u |
|
The number of croissants that Andy had remains unchanged.
If Andy had another 11 croissants in the end, the number of croissants that Betty and Andy had would be the same.
4 u - 4 = 1 u + 11
4 u - 1 u = 11 + 4
3 u = 15
1 u = 15 ÷ 3 = 5
Total number of croissants
= 4 u + 1 u
= 5 u
= 5 x 5
= 25
Answer(s): 25
