The number of banana cakes on display at a cafe was
45 of the number of wafers on display. After 16 banana cakes were bought and the staff added another 43 wafers, the number of wafers was twice the number of banana cakes. The last group of customers bought 7 wafers each, finishing all the wafers on display. How many customers were there in the last group?
| |
Banana cakes |
Wafers |
| Before |
4 u |
5 u |
| Change |
- 16 |
+ 43 |
| After |
4 u - 16 |
5 u + 43 |
Comparing banana cakes
and wafers
in the end |
1 |
2 |
The number of wafers was twice the number of banana cakes in the end.
Number of wafers in the end
= 2(4 u - 16)
= 8 u - 32
8 u - 32 = 5 u + 43 8 u - 5 u = 32 + 433 u = 75
1 u = 75 ÷ 3 = 25Number of wafers in the end= 5 u + 43= 5 x 25 + 43= 168Number of customers in the last group= 168 ÷ 7= 24 Answer(s): 24 
