The ratio of the number of biscuits to the number of shortbreads in a kiosk is 3 : 1. A biscuit costs $1.50 and a shortbread costs $0.50. If all the biscuits and shortbreads are sold, a sum of $100 will be collected. How many biscuits are there altogether?
|
Biscuits |
Shortbreads |
Total |
Number |
3 u |
1 u |
|
Value |
$1.50 |
$0.50 |
|
Total value |
4.5 u |
0.5 u |
$100 |
Amount collected if all the biscuits are sold
= 3 u x 1.5
= 4.5 u
Amount collected if all the shortbreads are sold
= 1 u x 0.5 u
= 0.5 u
Amount collected if all the biscuits and shortbreads are sold
= 4.5 u + 0.5 u
= 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Total number of biscuits
= 3 u
= 3 x 20
= 60
Answer(s): 60