The ratio of the number of puffs to the number of biscuits in a supermarket is 5 : 1. A puff costs $1.20 and a biscuit costs $0.80. If all the puffs and biscuits are sold, a sum of $204 will be collected. How many puffs are there altogether?
| |
Puffs |
Biscuits |
Total |
| Number |
5 u |
1 u |
|
| Value |
$1.20 |
$0.80 |
|
| Total value |
6 u |
0.8 u |
$204 |
Amount collected if all the puffs are sold
= 5 u x 1.2
= 6 u
Amount collected if all the biscuits are sold
= 1 u x 0.8 u
= 0.8 u
Amount collected if all the puffs and biscuits are sold
= 6 u + 0.8 u
= 6.8 u
6.8 u = 204
1 u = 204 ÷ 6.8 = 30
Total number of puffs
= 5 u
= 5 x 30
= 150
Answer(s): 150
