6painters can paint the fence in 15 hours. how long would it take 5 workers to do the same job?

12.5 hours

Step-by-step explanation:

15/6 is 2.5. 2.5 is how many hours per worker. 5 times 2.5 is 12.5 hours

12.5 hrs

Step-by-step explanation:

 We have given that:  6 painters can paint the fence in 15 hours

To find : In how many hours 5 workers do the job

Solution : 6 workers can paint the fence in = 15 hours

                1 worker can paint the fence in = 15/6  hours

                 5 workers can paint the fence in = 5×15/6 hours

                                                                       =25/2  hours

                                                                      =12.5  hours

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.

b

step-by-step explanation:

i dont know