What is the answer to this question! ?

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

the least value out of the data shown is 5, maybe if you post a picture with it i could a little more.

step-by-step explanation:

i think that you should ask google for the answer to that problem because if we don't know it google does

what i would say the best answer is a. 40.5