A toothed wheel of diameter 50cm is attached to a smaller wheel of diameter 30cm. How many revolutions will the smaller wheel make when the larger one makes 15 revolutions?  Select
A) 18
B) 20
C) 25
D) 30
E) 32
Distance moved by toothed wheel in 15 revolutions= (15*2*22/7*25)   Distance moved by smaller wheel in 1 revolution= (2*22/7*15)   Therefore, required number of revolutions= (15*44/7*25*7/ 44*15)= 25   ANSWER:25
<result>C</result>
A toothed wheel of diameter 50cm is attached to a smaller wheel of diameter 30cm. How many revolutions will the smaller wheel make when the larger one makes 15 revolutions?