Question 315143
Let A be the number of luxury cars sold. 
Then A+20 is the number of sports cars sold.
We know that,
{{{(A+20)/A)=3/2}}}
{{{1+20/A=3/2}}}
{{{20/A=1/2}}}
{{{A=40}}}
40 luxury cars and 60 sports cars were sold.