Tammy wanted to buy some muffins and puffs. The cost of a muffin was
14 the cost of a puff. A set of 5 muffins and 3 puffs cost $10.20. What was the total amount Tammy had to pay for 3 muffins and 7 puffs?
| |
Muffins |
Puffs |
Total |
| Number |
5 |
3 |
|
| Value |
1 u |
4 u |
|
| Total value |
5 u |
12 u |
17 u |
Total cost of muffins and puffs
= 5 u + 12 u
= 17 u
17 u = 10.2
1 u = 10.20 ÷ 17 = 0.6
Cost of 3 muffins and 7 puffs
= 3 x 1 u + 7 x 4 u
= 3 u + 28 u
= 31 u
= 31 x 0.6
= $18.60
Answer(s): $18.60
