Let's get Mathematical Part 11

Given: hour wheel 64 teeth, minute wheel 42 teeth, cannon pinion 16 leaves. Calculate the number of leaves of the pinion.

N1 = Z1 Z3
N2 Z2 Z4

1 = 16 x ?
12 64 x 48

1 x ?
4 x 48

1 x ?
192

192/12 = 16