The ratio of the number of biscuits to the number of wafers in a supermarket is 6 : 1. A biscuit costs $1.60 and a wafer costs $0.80. If all the biscuits and wafers are sold, a sum of $416 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Wafers |
Total |
| Number |
6 u |
1 u |
|
| Value |
$1.60 |
$0.80 |
|
| Total value |
9.6 u |
0.8 u |
$416 |
Amount collected if all the biscuits are sold
= 6 u x 1.6
= 9.6 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
= 9.6 u + 0.8 u
= 10.4 u
10.4 u = 416
1 u = 416 ÷ 10.4 = 40
Total number of biscuits
= 6 u
= 6 x 40
= 240
Answer(s): 240
