The ratio of the number of biscuits to the number of croissants in a kiosk is 5 : 1. A biscuit costs $1.50 and a croissant costs $0.90. If all the biscuits and croissants are sold, a sum of $168 will be collected. How many biscuits are there altogether?
|
Biscuits |
Croissants |
Total |
Number |
5 u |
1 u |
|
Value |
$1.50 |
$0.90 |
|
Total value |
7.5 u |
0.9 u |
$168 |
Amount collected if all the biscuits are sold
= 5 u x 1.5
= 7.5 u
Amount collected if all the croissants are sold
= 1 u x 0.9 u
= 0.9 u
Amount collected if all the biscuits and croissants are sold
= 7.5 u + 0.9 u
= 8.4 u
8.4 u = 168
1 u = 168 ÷ 8.4 = 20
Total number of biscuits
= 5 u
= 5 x 20
= 100
Answer(s): 100