The ratio of the number of biscuits to the number of macarons in a stall is 3 : 1. A biscuit costs $1.90 and a macaron costs $0.40. If all the biscuits and macarons are sold, a sum of $122 will be collected. How many biscuits are there altogether?
| |
Biscuits |
Macarons |
Total |
| Number |
3 u |
1 u |
|
| Value |
$1.90 |
$0.40 |
|
| Total value |
5.7 u |
0.4 u |
$122 |
Amount collected if all the biscuits are sold
= 3 u x 1.9
= 5.7 u
Amount collected if all the macarons are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the biscuits and macarons are sold
= 5.7 u + 0.4 u
= 6.1 u
6.1 u = 122
1 u = 122 ÷ 6.1 = 20
Total number of biscuits
= 3 u
= 3 x 20
= 60
Answer(s): 60
