Answer:
Explanation:
To find miles, multiply gallons times miles per gallon.
a. (10.5 gal) × (22 mi/gal) = 231 mi
b. (20 gal) × (22 mi/gal) = 440 mi
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Comment on the solution
In a problem such as this, it can help you do the math properly if you keep the units with the numbers. If it is confusing for you to use "gal" and "mi" to represent gallons and miles (respectively), you can use "g" and "m" instead. Pretend they are variables.
Effectively, you're multiplying (10.5g)(22m/g) = (10.5·22)mg/g = 231m. The multiplication and cancellation of the variables (units) is the same process you use with variables in any expression or equation. If the units don't come out right in your answer, chances are you made a mistake somewhere.