Diana wanted to buy some puffs and tarts. The cost of a puff was
15 the cost of a tart. A set of 6 puffs and 2 tarts cost $14.40. What was the total amount Diana had to pay for 10 puffs and 9 tarts?
| |
Puffs |
Tarts |
Total |
| Number |
6 |
2 |
|
| Value |
1 u |
5 u |
|
| Total value |
6 u |
10 u |
16 u |
Total cost of puffs and tarts
= 6 u + 10 u
= 16 u
16 u = 14.4
1 u = 14.40 ÷ 16 = 0.9
Cost of 10 puffs and 9 tarts
= 10 x 1 u + 9 x 5 u
= 10 u + 45 u
= 55 u
= 55 x 0.9
= $49.50
Answer(s): $49.50
