The ratio of the number of puffs to the number of tarts in a supermarket is 3 : 1. A puff costs $1.60 and a tart costs $0.60. If all the puffs and tarts are sold, a sum of $108 will be collected. How many puffs are there altogether?
| |
Puffs |
Tarts |
Total |
| Number |
3 u |
1 u |
|
| Value |
$1.60 |
$0.60 |
|
| Total value |
4.8 u |
0.6 u |
$108 |
Amount collected if all the puffs are sold
= 3 u x 1.6
= 4.8 u
Amount collected if all the tarts are sold
= 1 u x 0.6 u
= 0.6 u
Amount collected if all the puffs and tarts are sold
= 4.8 u + 0.6 u
= 5.4 u
5.4 u = 108
1 u = 108 ÷ 5.4 = 20
Total number of puffs
= 3 u
= 3 x 20
= 60
Answer(s): 60
