Question 166
Find a repeater machine that will do the same work as a (× 18) machine.
Since, 18 are 12, 12, 12, So, 18=12×12×12=(12)3 Hence, (× 123) repeater machine can do the same work as a (× 12) machine.
Question 165
Find two repeater machines that will do the same work as a (× 81) machine.
Question 159(i)
Find a single repeater machine that will do the same work as each hook-up.
Question 159(v)