The pitch of a screw is the distance between its threads. With each complete rotation, the screw goes in or out a distance equal to its pitch. After 9 complete rotations, the screw is extended 4/14 inch into the wallboard. Find the pitch of the screw.

Solution:

The pitch of the screw is x

9x=4/14

x= 2/63

So the pitch of the screw is 2/63 in