The number of banana cakes on display at a cafe was
34 of the number of puffs on display. After 20 banana cakes were bought and the staff added another 43 puffs, the number of puffs was five times the number of banana cakes. The last group of customers bought 5 puffs each, finishing all the puffs on display. How many customers were there in the last group?
| |
Banana cakes |
Puffs |
| Before |
3 u |
4 u |
| Change |
- 20 |
+ 43 |
| After |
3 u - 20 |
4 u + 43 |
Comparing banana cakes
and puffs
in the end |
1 |
5 |
The number of puffs was five times the number of banana cakes in the end.
Number of puffs in the end
= 5(3 u - 20)
= 15 u - 100
15 u - 100 = 4 u + 43 15 u - 4 u = 100 + 4311 u = 143
1 u = 143 ÷ 11 = 13Number of puffs in the end= 4 u + 43= 4 x 13 + 43= 95Number of customers in the last group= 95 ÷ 5= 19 Answer(s): 19 
