The ratio of the number of shortbreads to the number of wafers in a kiosk is 3 : 1. A shortbread costs $1.80 and a wafer costs $0.40. If all the shortbreads and wafers are sold, a sum of $116 will be collected. How many shortbreads are there altogether?
| |
Shortbreads |
Wafers |
Total |
| Number |
3 u |
1 u |
|
| Value |
$1.80 |
$0.40 |
|
| Total value |
5.4 u |
0.4 u |
$116 |
Amount collected if all the shortbreads are sold
= 3 u x 1.8
= 5.4 u
Amount collected if all the wafers are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the shortbreads and wafers are sold
= 5.4 u + 0.4 u
= 5.8 u
5.8 u = 116
1 u = 116 ÷ 5.8 = 20
Total number of shortbreads
= 3 u
= 3 x 20
= 60
Answer(s): 60
