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A car needs 3 gallons of gas every 70 miles. how much gas would it need for 105 miles?

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3 Answers

Hi Alice;
(3 gallons)/(70 miles)=(x gallons)/(105 miles)
Please note, both sides are in the units of gallons/miles.  These cancel.
(3 gallons)/(70 miles)=(x gallons)/(105 miles)
3/70=x/105
We are now ready to perform calculations.
Let's multiply both sides by 105...
(105)(3/70)=(x/105)(105)
4.5=x
The car needs 4.5 gallons.