SOLUTION: How much gas will it take if I am driving 400 miles with a 21 mpg gas tank?

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Question 763093: How much gas will it take if I am driving 400 miles with a 21 mpg gas tank?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
This is just simple proportion. The 21 mpg means %2821+miles%2F1+gallon%29. Understand the lack of spaces in the rendered text.

The proportion is 400+%2FG+=21%2F1 where G is the gallons of how much gasoline.