Zara bought four times as many croissants as Oscar. After Zara ate 7 croissants, she had 8 more croissants than Oscar. How many croissants did they buy altogether?
| |
Zara |
Oscar |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
- 7 |
|
|
| After |
4 u - 7 |
1 u |
|
The number of croissants that Oscar had remains unchanged.
If Oscar had another 8 croissants in the end, the number of croissants that Zara and Oscar had would be the same.
4 u - 7 = 1 u + 8
4 u - 1 u = 8 + 7
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
