Question

The gas tank of Dave’s car has a capacity of 12 gallons. The tank was 38 full before Dave filled it to capacity. It cost him $2.50 per gallon of gas. How much did Dave spend, in dollars, to fill the tank to capacity?

Answer 1

$ 30

Step-by-step explanation:

Capacity of tank = 12 gallon

Cost of one gallon = $ 2.50

The cost of 12 gallon = 12 x 2.50 = $ 30

Thus, the cost of 12 gallon fuel is $ 30.

Answer 2

$ 18.75

Step-by-step explanation:

given,

capacity of the Dave’s car = 12 gallons

Assuming that the tank is 3/8 full before

Cost of gas per gallon = $2.50 per gallon of gas

Volume Dave have to fill

=
`1 - (3)/(8)`

=
`(5)/(8)` of full tank

=
`(5)/(8)* 12`

volume Dave have to fill = 7.5 gallons

total money Dave spent

= 7.5 gallons x $2.50

= $ 18.75

Dave have to spend $ 18.75 to fill tank to it capacity.