The ratio of the number of biscuits to the number of croissants in a supermarket is 2 : 1. A biscuit costs $1.80 and a croissant costs $0.50. If all the biscuits and croissants are sold, a sum of $123 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Croissants |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.80 |
$0.50 |
|
| Total value |
3.6 u |
0.5 u |
$123 |
Amount collected if all the biscuits are sold
= 2 u x 1.8
= 3.6 u
Amount collected if all the croissants are sold
= 1 u x 0.5 u
= 0.5 u
Amount collected if all the biscuits and croissants are sold
= 3.6 u + 0.5 u
= 4.1 u
4.1 u = 123
1 u = 123 ÷ 4.1 = 30
Total number of biscuits
= 2 u
= 2 x 30
= 60
Answer(s): 60
