Question

Six machines, each working at the same constant rate, together can complete a certain job in 12 days. How many additional machines, each working at the same constant rate, will be needed to complete the Job in 8 days?A. 2B. 3C. 4D. 6E. 8

Answer 1

The answer to your question is letter C

Explanation:

This is a problem with the inverse rule of three because we expect that more machines can complete the same work in fewer days.

6 machines ------------------ 12 days

x machines ------------------- 8 days

x machines =
`((8 days)(6 machines))/(12 days)`

`x machines = (48 machines)/(12)`

x = 4 machines