Math Destroyer Test 2 #17

[DrRoyal Pains]

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For this problem, couldn't you just look at it this way: The diameter of the front wheel is 10 while the rear wheel has a diameter of 5, thus, the front wheel is 2x larger than the back wheel. If the front wheel makes 18 revolutions, the back wheel will have to do twice as many revolutions, thus 18*2 = 36? (Thats the way I did it at least)

 

[KyoPhan]

Yep, that works fine because the equation for distance travel is (revolutions)2 pi r.