The number of banana cakes on display at a cafe was
34 of the number of croissants on display. After 20 banana cakes were bought and the staff added another 36 croissants, the number of croissants was twice the number of banana cakes. The last group of customers bought 4 croissants each, finishing all the croissants on display. How many customers were there in the last group?
| |
Banana cakes |
Croissants |
| Before |
3 u |
4 u |
| Change |
- 20 |
+ 36 |
| After |
3 u - 20 |
4 u + 36 |
Comparing banana cakes
and croissants
in the end |
1 |
2 |
The number of croissants was twice the number of banana cakes in the end.
Number of croissants in the end
= 2(3 u - 20)
= 6 u - 40
6 u - 40 = 4 u + 36 6 u - 4 u = 40 + 362 u = 76
1 u = 76 ÷ 2 = 38Number of croissants in the end= 4 u + 36= 4 x 38 + 36= 188Number of customers in the last group= 188 ÷ 4= 47 Answer(s): 47 
