Question

Melissa’s family is driving out of state to her grandmother’s house. They know that it takes 20 gallons of gas to get there, and the cost of three gallons of gasoline is $10.50. How much should the family budget to make the one-way trip?

Answer 1

At least $73.50 for 7x3 is 21 gallons and 10.50x7 is $73.50

Answer 2

First, find the unit price.

10.50/3=3.50 per gallon

multiply 3.50 and 20 to find the price for 20 gallons of gas.

3.50*20=70

Their budget will be $70