| A wheel that has 6 cogs in meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions made by the larger wheel is |
A) 4
B) 9
C) 12
D) 49
Correct Answer: B
Solution :
| Let the required number of revolutions made by larger wheel be x. Then, \[14:6::21:x\] |
| \[\Rightarrow \] \[14\times x=6\times 21\]\[\Rightarrow \]\[x=\left( \frac{6\times 21}{14} \right)=9\] |
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