Question

The formula a=d/g gives the average gas mileage a of a vehicle that uses g gallons of gas to travel d miles. Use the formula to find how many gallons of gas a vehicle with an average gas mileage of 20.2 miles per gallon will use to travel 75 miles. Round to nearest tenth.

Answer 1

1)s=n/2(a+l)
distribute the 2
s=n/2a+2l
mutiply by (2a+2l)
s(2a+2l)=n
distribute the s
2as+2al=n
subtract 2as
2al=n-2as
divide by 2a
l=(n-2as)/2a

2) a=d/g
20.2=75/d
multiply by d
20.2d=75
divide by 20.2
d=3.7 miles

Answer 2

20.2=75/g
g=75/20.2
g=3.71 gallons