The ratio of the number of puffs to the number of croissants in a stall is 2 : 1. A puff costs $1.30 and a croissant costs $0.40. If all the puffs and croissants are sold, a sum of $60 will be collected. How many puffs are there altogether?
| |
Puffs |
Croissants |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.30 |
$0.40 |
|
| Total value |
2.6 u |
0.4 u |
$60 |
Amount collected if all the puffs are sold
= 2 u x 1.3
= 2.6 u
Amount collected if all the croissants are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the puffs and croissants are sold
= 2.6 u + 0.4 u
= 3 u
3 u = 60
1 u = 60 ÷ 3 = 20
Total number of puffs
= 2 u
= 2 x 20
= 40
Answer(s): 40
