The ratio of the number of puffs to the number of shortbreads in a stall is 2 : 1. A puff costs $1.30 and a shortbread costs $0.40. If all the puffs and shortbreads are sold, a sum of $90 will be collected. How many puffs are there altogether?
| |
Puffs |
Shortbreads |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.30 |
$0.40 |
|
| Total value |
2.6 u |
0.4 u |
$90 |
Amount collected if all the puffs are sold
= 2 u x 1.3
= 2.6 u
Amount collected if all the shortbreads are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the puffs and shortbreads are sold
= 2.6 u + 0.4 u
= 3 u
3 u = 90
1 u = 90 ÷ 3 = 30
Total number of puffs
= 2 u
= 2 x 30
= 60
Answer(s): 60
