Question

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

Answer 1

Answer:

(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......

Answer 2

Answer:

70mile =3 gallon

1 mile =3/70 gallon

1 x105 mile = (3/70)x105 gallon

Which is 4.5 gallons

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