The ratio of the number of biscuits to the number of croissants in a supermarket is 2 : 1. A biscuit costs $1.10 and a croissant costs $0.30. If all the biscuits and croissants are sold, a sum of $100 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Croissants |
Total |
| Number |
2 u |
1 u |
|
| Value |
$1.10 |
$0.30 |
|
| Total value |
2.2 u |
0.3 u |
$100 |
Amount collected if all the biscuits are sold
= 2 u x 1.1
= 2.2 u
Amount collected if all the croissants are sold
= 1 u x 0.3 u
= 0.3 u
Amount collected if all the biscuits and croissants are sold
= 2.2 u + 0.3 u
= 2.5 u
2.5 u = 100
1 u = 100 ÷ 2.5 = 40
Total number of biscuits
= 2 u
= 2 x 40
= 80
Answer(s): 80
