SAT Math: Rates and Using Units

Lesson: Rates

After you watch the lesson above, try this practice problem
A tank is filling up with water at a rate of 20 gallons per minute. If there are 700 gallons in the tank now, how many gallons will be in the tank after minutes?

Try this practice problem
A student has an outstanding balance of $2,700 on his credit card. If he pays $90 per month, what will the balance be after months, assuming there is no interest or other fees and the student does not purchase anything with the credit card?

Try this practice problem
Jack's car has a gas mileage of 25 miles per gallon when the car travels at 55 miles per hour. The car's gas tank has 20 gallons of gas before he starts driving. If Jack drives 55 miles per hour, which of the following functions, , models the number of gallons of gas remaining in the tank hours after the trip begins?