The number of strawberry cakes on display at a cafe was
45 of the number of wafers on display. After 21 strawberry cakes were bought and the staff added another 45 wafers, the number of wafers was twice the number of strawberry cakes. The last group of customers bought 5 wafers each, finishing all the wafers on display. How many customers were there in the last group?
|
Strawberry cakes |
Wafers |
Before |
4 u |
5 u |
Change |
- 21 |
+ 45 |
After |
4 u - 21 |
5 u + 45 |
Comparing strawberry cakes and wafers in the end |
1 |
2 |
The number of wafers was twice the number of strawberry cakes in the end.
Number of wafers in the end
= 2(4 u - 21)
= 8 u - 42
8 u - 42 = 5 u + 45 8 u - 5 u = 42 + 453 u = 87
1 u = 87 ÷ 3 = 29Number of wafers in the end= 5 u + 45= 5 x 29 + 45= 190Number of customers in the last group= 190 ÷ 5= 38 Answer(s): 38