Gabby bought thrice as many croissants as Fred. After Gabby ate 3 croissants, she had 9 more croissants than Fred. How many croissants did they buy altogether?
| |
Gabby |
Fred |
Total |
| Before |
3 u |
1 u |
4 u |
| Change |
- 3 |
|
|
| After |
3 u - 3 |
1 u |
|
The number of croissants that Fred had remains unchanged.
If Fred had another 9 croissants in the end, the number of croissants that Gabby and Fred had would be the same.
3 u - 3 = 1 u + 9
3 u - 1 u = 9 + 3
2 u = 12
1 u = 12 ÷ 2 = 6
Total number of croissants
= 3 u + 1 u
= 4 u
= 4 x 6
= 24
Answer(s): 24
