Question

Joe spent $4.36 for gasoline in driving 68 miles. How much would he spend in driving 85 miles?

Answer 1

He will spend $5.45 if he is driving 85 miles.
How can we figure this out mathematically?
4.36/68=0.064
That means every mile he drives he spends on average 6 cents.
Now 0.064 * 85 equals $5.45.
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