Question

A van travels 260 miles on 13 gallons of gas. Find how many gallons the van needs to travel 500 miles?

Answer 1

25 gallons

Explanation:

Assuming miles-per-gallon is a constant, the amount of gas is proportional to the miles driven:

gallons/(500 mi) = (13 gal)/(260 mi)

gallons = (500 mi)/(260 mi)(13 gal) . . . . multiply by 500 mi

gallons = 25 gal . . . . do the arithmetic

The van will need 25 gallons of gas to go 500 miles.