Question

if three painters can paint four room sin 9 hours how long will it take one painter to paint one room

Answer 1

6 1/2 hours

Explanation:

the ratio of (painters*hours)/rooms is constant, so

3*9/4 = 27/4

or, consider that 1 painter can paint those 4 rooms in 27 hours

so it will take him 27/4 hours to do one room