Opal wanted to buy some macarons and biscuits. The cost of a macaron was
38 the cost of a biscuit. A set of 5 macarons and 3 biscuits cost $7.80. What was the total amount Opal had to pay for 7 macarons and 4 biscuits?
| |
Macarons |
Biscuits |
Total |
| Number |
5 |
3 |
|
| Value |
3 u |
8 u |
|
| Total value |
15 u |
24 u |
39 u |
Total cost of macarons and biscuits
= 15 u + 24 u
= 39 u
39 u = 7.8
1 u = 7.80 ÷ 39 = 0.2
Cost of 7 macarons and 4 biscuits
= 7 x 3 u + 4 x 8 u
= 21 u + 32 u
= 53 u
= 53 x 0.2
= $10.60
Answer(s): $10.60
