The ratio of the number of muffins to the number of wafers in a shop is 3 : 1. A muffin costs $1.30 and a wafer costs $0.60. If all the muffins and wafers are sold, a sum of $90 will be collected. How many muffins are there altogether?
| |
Muffins |
Wafers |
Total |
| Number |
3 u |
1 u |
|
| Value |
$1.30 |
$0.60 |
|
| Total value |
3.9 u |
0.6 u |
$90 |
Amount collected if all the muffins are sold
= 3 u x 1.3
= 3.9 u
Amount collected if all the wafers are sold
= 1 u x 0.6 u
= 0.6 u
Amount collected if all the muffins and wafers are sold
= 3.9 u + 0.6 u
= 4.5 u
4.5 u = 90
1 u = 90 ÷ 4.5 = 20
Total number of muffins
= 3 u
= 3 x 20
= 60
Answer(s): 60
