Question

The last time David filled up his truck with gas, he spent $27.44 for 7 gallons. if the price is the same, how much will he pay?

Answer 1

How much will he pay for what? There isn't an end amount stated so it is an impossible question.
If you want to find 1 gallon, divide 27.44 by 7 (= 3.92)
Then multiply 3.92 by whatever amount you require.
I can't give you the exact answer because I think you may have missed out some of the question! Sorry x