Question

10 robots can do work in 18 days. How many robots are needed to complete a work in 26 days?​

Answer 1

Answer:

ans=15 Robots

Explanation:

10 robot =18 days

1 ''. =18/10=1.8 day

no.of robot needed to complete a work in 26 days=26/1.8

=14.5robot=15robots

Answer 2

7 robots are needed to complete the work in 26 days

Given:

Initial case

No. of robots N1= 10

No. of days needed for 10 robots to complete the work D1 = 18 days

Final case

No. of days to complete the work D2 = 26 days

To find:

No. of robots needed to complete the work in 26 days(N2)

Solution:

Let the no. of robots in the final case be 'N2'

We know that,

Total work done = No. of robots x No. of days worked is a constant

i.e  W = N1 x D1 = N2 x D2

i.e        10 x 18  = 'N2' x 26

            ∴ N2 = $\frac{10 X 18}{26}$

                     =  6.92 ≈ 7

Therefore, 7 robots are needed to complete the work in 26 days