Question 262970
.
Perimeter of front wheel = 30, back wheel = 20. If front wheel revolves 240 times. 
How many revolutions will the back wheel take?
~~~~~~~~~~~~~~~~~~~~~~~~~~



        The logic, the calculations and the final answer in the post by @mananth all are incorrect.

        See my correct solution below.



As the front wheel makes 240 revolutions, the car moves 240*30 units forward.


Hence, the back wheel makes  &nbsp;&nbsp;{{{(240*30)/20}}} = 12*30 = 360 &nbsp;&nbsp;revolutions.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>