Please help, it's very important! The driver gear has 4 teeth (T), and its speed is 80 RPM. The driven gear needs a speed of 40 rpm. How many teeth (t) should it have?

The driver gear has 40 teeth (T). The driven gear has 10 teeth (t), and a speed of 12 rpm. What is the speed (RPM) of the driver gear?

Thank you so much!!!

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs)

answer: 1 + 1 = 11

step-by-step explanation:

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12