The ratio of the number of wafers to the number of croissants in a supermarket is 2 : 1. A wafer costs $1.10 and a croissant costs $0.40. If all the wafers and croissants are sold, a sum of $52 will be collected. How many wafers are there altogether?
| |
Wafers |
Croissants |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.10 |
$0.40 |
|
| Total value |
2.2 u |
0.4 u |
$52 |
Amount collected if all the wafers are sold
= 2 u x 1.1
= 2.2 u
Amount collected if all the croissants are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the wafers and croissants are sold
= 2.2 u + 0.4 u
= 2.6 u
2.6 u = 52
1 u = 52 ÷ 2.6 = 20
Total number of wafers
= 2 u
= 2 x 20
= 40
Answer(s): 40
