The ratio of the number of biscuits to the number of wafers in a shop is 5 : 1. A biscuit costs $1.90 and a wafer costs $0.80. If all the biscuits and wafers are sold, a sum of $103 will be collected. How many biscuits are there altogether?
|
Biscuits |
Wafers |
Total |
Number |
5 u |
1 u |
|
Value |
$1.90 |
$0.80 |
|
Total value |
9.5 u |
0.8 u |
$103 |
Amount collected if all the biscuits are sold
= 5 u x 1.9
= 9.5 u
Amount collected if all the wafers are sold
= 1 u x 0.8 u
= 0.8 u
Amount collected if all the biscuits and wafers are sold
= 9.5 u + 0.8 u
= 10.3 u
10.3 u = 103
1 u = 103 ÷ 10.3 = 10
Total number of biscuits
= 5 u
= 5 x 10
= 50
Answer(s): 50