A six-cog wheel is meshing with a bigger fourteen-cog wheel. When the smaller wheel has completed 21 rotations, the larger wheel has completed the following amount of revolutions:
A. 4
B. 9
C. 12
D. 49
Answer:A
A six-cog wheel is meshing with a bigger fourteen-cog wheel. When the smaller wheel has completed 21 rotations, the larger wheel has completed the following amount of revolutions:
A. 4 B. 9 C. 12 D. 49
Explanation: Let x be the number of revolutions required by the bigger wheel.Then there will be more cogs and fewer rotations (Indirect Proportion),x 14 x x = 6 x 21 x 14 x ,6 x 21/14 = x.x equals 9.