Question

Robert and his coworkers brought 11 work trucks to a service station for oil changes. While there they also put 6 gallons of gas into each vehicle. The cost of gas was $3.52 a gallon. The total bill was $694.32. What was the cost of an oil change for 1 truck?

Answer 1

The cost of an oil change for 1 truck was $42

Explanation:

Let

x -----> the cost of an oil change for 1 truck

y -----> the cost of gas for 1 truck

z ----> the total bill

we know that

`z=11[x+y]`

we have

`z=\$694.32`

`y=(6)(3.52)=\$21.12`

substitute and solve for x

`694.32=11[x+21.12]`

`x=(694.32/11)-21.12`

`x=\$42`