Question

Ms. Dunn spent $10.70 to buy a total of 24 slices of pie or cookies. A slice of pie costs $0.80 and a cookie costs $0.30. How many slices of pie did Ms. Dunn buy?

a. 7

b. 12

c. 17

d. 10

Answer 1

Answer:(a)

Explanation:

Given

Ms. Dunn spent
`\$ 10.70` to 24 slice of pie or cookie

A pie cost
`\$ 0.80`

and Cookie cost
`\$ 0.30`

Suppose Dunn buy x pie and y cookie

So
`10.70=x* 0.8+y* 0.3`

and
`x+y=24`

Solving above two equations we get

`x=7` and
`y=17`

So Ms. Dunn buy 7 piece of pie