The number of strawberry cakes on display at a cafe was
56 of the number of wafers on display. After 21 strawberry cakes were bought and the staff added another 42 wafers, the number of wafers was four times the number of strawberry cakes. The last group of customers bought 6 wafers each, finishing all the wafers on display. How many customers were there in the last group?
| |
Strawberry cakes |
Wafers |
| Before |
5 u |
6 u |
| Change |
- 21 |
+ 42 |
| After |
5 u - 21 |
6 u + 42 |
Comparing strawberry cakes
and wafers
in the end |
1 |
4 |
The number of wafers was four times the number of strawberry cakes in the end.
Number of wafers in the end
= 4(5 u - 21)
= 20 u - 84
20 u - 84 = 6 u + 42 20 u - 6 u = 84 + 4214 u = 126
1 u = 126 ÷ 14 = 9Number of wafers in the end= 6 u + 42= 6 x 9 + 42= 96Number of customers in the last group= 96 ÷ 6= 16 Answer(s): 16 
