The ratio of the number of puffs to the number of biscuits in a stall is 6 : 1. A puff costs $1.20 and a biscuit costs $0.50. If all the puffs and biscuits are sold, a sum of $308 will be collected. How many puffs are there altogether?
| |
Puffs |
Biscuits |
Total |
| Number |
6 u |
1 u |
|
| Value |
$1.20 |
$0.50 |
|
| Total value |
7.2 u |
0.5 u |
$308 |
Amount collected if all the puffs are sold
= 6 u x 1.2
= 7.2 u
Amount collected if all the biscuits are sold
= 1 u x 0.5 u
= 0.5 u
Amount collected if all the puffs and biscuits are sold
= 7.2 u + 0.5 u
= 7.7 u
7.7 u = 308
1 u = 308 ÷ 7.7 = 40
Total number of puffs
= 6 u
= 6 x 40
= 240
Answer(s): 240
