Question

Diya and Rehana together can do a piece of work in 6 days and Rihanna alone can do the same work in 9 days in how many days can there alone complete the work​

Answer 1

The Work Rihanna does in 1 Day = 1/9

The work Diya does in 1 day = 1/x

Total Work = 1/6

                   = 1/9 + 1/x = 1/6

                   = 9 + x / 9x = 1/6

                   = 9 + x = 3x/2

                   = 18 + 2x = 3x

           Therefore, x = 18

Hence, Diya takes 18 days to finish the work alone