Yatin K. answered 10/12/17
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Let the number of cars be "C" and number of motorcycles be "M".
Then from first statement we get
C+M = 20 -- 1)
Assuming motor cycles have 2 wheels and cars have 4 we can say that
2M + 4C = 50 --2)
Solve equations 1 and 2 to get the number of motorcycles.