The ratio of the number of biscuits to the number of tarts in a shop is 2 : 1. A biscuit costs $1.60 and a tart costs $0.40. If all the biscuits and tarts are sold, a sum of $108 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Tarts |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.60 |
$0.40 |
|
| Total value |
3.2 u |
0.4 u |
$108 |
Amount collected if all the biscuits are sold
= 2 u x 1.6
= 3.2 u
Amount collected if all the tarts are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the biscuits and tarts are sold
= 3.2 u + 0.4 u
= 3.6 u
3.6 u = 108
1 u = 108 ÷ 3.6 = 30
Total number of biscuits
= 2 u
= 2 x 30
= 60
Answer(s): 60
