Multi Step conversion

Multi-step conversions will involve a mixture of ratios and/or equations. Questions will either go from a proportional ratio to an overall total, or they will ask for a conversion of one ratio to another (usually in the form of a unit conversion).

One of the most common versions of this question will involve mph and gas costs in miles/gallon.

For example, a problem might say that a person can drive their car, which gets 50 miles-per-gallon, for a maximum of 1,340 miles. If gas costs $$3.28/gallon, how much would it cost to fill the car’s tank?

Since the cost is based on the number of gallons, the mpg and mileage must be used to calculate the size of the car’s tank. If they can drive a maximum of 1,340 miles getting 50 miles-per-gallon, then that means the car has a tank that holds 26.8 gallons.

Therefore, the cost of filling the tank is: 26.8 * 

3.28=87.90.