The ratio of the number of puffs to the number of wafers in a stall is 2 : 1. A puff costs $1.50 and a wafer costs $0.60. If all the puffs and wafers are sold, a sum of $72 will be collected. How many puffs are there altogether?
| |
Puffs |
Wafers |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.50 |
$0.60 |
|
| Total value |
3 u |
0.6 u |
$72 |
Amount collected if all the puffs are sold
= 2 u x 1.5
= 3 u
Amount collected if all the wafers are sold
= 1 u x 0.6 u
= 0.6 u
Amount collected if all the puffs and wafers are sold
= 3 u + 0.6 u
= 3.6 u
3.6 u = 72
1 u = 72 ÷ 3.6 = 20
Total number of puffs
= 2 u
= 2 x 20
= 40
Answer(s): 40
