2016 · Q63
The diameter of the front wheel of an engine is 2x cm and that of rear wheel is 2y cm. To cover the same distance, what is the number of times the rear wheel revolves when the front wheel revolves n times ?
Elementary MathematicsMensuration
- An/xy
- Bny/x
- Cnx/y
- Dxy/n
Explanation
Both wheels cover the same distance: n(π·2x) = m(π·2y). Solving for the rear wheel's revolutions m gives m = nx/y. Hence option C.