The ratio of the number of wafers to the number of muffins in a shop is 6 : 1. A wafer costs $1.70 and a muffin costs $0.60. If all the wafers and muffins are sold, a sum of $108 will be collected. How many wafers are there altogether?
| |
Wafers |
Muffins |
Total |
| Number |
6 u |
1 u |
|
| Value |
$1.70 |
$0.60 |
|
| Total value |
10.2 u |
0.6 u |
$108 |
Amount collected if all the wafers are sold
= 6 u x 1.7
= 10.2 u
Amount collected if all the muffins are sold
= 1 u x 0.6 u
= 0.6 u
Amount collected if all the wafers and muffins are sold
= 10.2 u + 0.6 u
= 10.8 u
10.8 u = 108
1 u = 108 ÷ 10.8 = 10
Total number of wafers
= 6 u
= 6 x 10
= 60
Answer(s): 60
