Question

Suresh can do a piece of work in 40 days he works at it for 5 days and leaves then Roshan finishes it in 21 days in how many days will Suresh and Roshan working together do the work

Answer 1

Step-by-step explanation:

Given ,

Suresh can complete a work in 40 days. So his one day work is 1/40

Let Roshan can complete the work in x days.

So , one day work of roshan = 1/x

ATQ ,

Work left after Suresh left = 1-1/8 = 7/8

Now ,

21(1/x) = 7/8

(1/x) = 7/(8×21)

1/x = 1/24

x = 24

Their combined one day work = 1/24 +1/40 =8/120 = 2/30 = 1/15

So , they'll together complete the work in 15 days