Question 1117934
R, fuel efficiency
V, volume of fuel
D, distance
RV=D
              
<pre>
                Fuel Efficiency      Volume         Distance

FirstCar          35                  v              35v

SecondCar         15                 55-v           15(55-v)

Totals                                 55             1225

</pre>
v, the unknown volume of fuel the first car used


{{{highlight_green(35v+15(55-v)=1225)}}}
Solve this equation and then evaluate 55-v.


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POSSIBLE STEPS
{{{7v+3(55-v)=245}}}
{{{7v+165-3v=245}}}
{{{4v=245-165}}}
{{{4v=80}}}
{{{highlight(v=20)}}}-----------first car
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{{{highlight(55-v=35)}}}---------second car