The ratio of the number of croissants to the number of biscuits in a supermarket is 2 : 1. A croissant costs $1.80 and a biscuit costs $0.40. If all the croissants and biscuits are sold, a sum of $160 will be collected. How many croissants are there altogether?
| |
Croissants |
Biscuits |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.80 |
$0.40 |
|
| Total value |
3.6 u |
0.4 u |
$160 |
Amount collected if all the croissants are sold
= 2 u x 1.8
= 3.6 u
Amount collected if all the biscuits are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the croissants and biscuits are sold
= 3.6 u + 0.4 u
= 4 u
4 u = 160
1 u = 160 ÷ 4 = 40
Total number of croissants
= 2 u
= 2 x 40
= 80
Answer(s): 80
