The ratio of the number of biscuits to the number of cookies in a shop is 5 : 1. A biscuit costs $1.60 and a cookie costs $0.40. If all the biscuits and cookies are sold, a sum of $168 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Cookies |
Total |
| Number |
5 u |
1 u |
|
| Value |
$1.60 |
$0.40 |
|
| Total value |
8 u |
0.4 u |
$168 |
Amount collected if all the biscuits are sold
= 5 u x 1.6
= 8 u
Amount collected if all the cookies are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the biscuits and cookies are sold
= 8 u + 0.4 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
