Rati, Sati and Parvati can do a job in 15 days. After working with Sati and Parvati for 5 days, Rati leaves. Then Sati and Parvati finish it in 20 days more. In how many days can Rati do the job alone?

Options
- 27 days
- 30 days
- 32 days
- 23 days

CORRECT ANSWER : 30 days

Discussion Board
Correct answer

(R+S+P)=1/15

S+P = 1/15-R

(R+S+P)5 + (S+P)20 = 1

5R + 5S+ 5P +20S +20P = 1

5R + 25S + 25P = 1

5R + 25 (S+P) = 1

5R +25 (1/15-R) = 1

5R +25/15-25R=1

25/15-20R=1

5/3-20R=1

5/3-1=20R

2/3=20R

2=60R

2/60=R

.''.R=1/30

R=30days


Prasath 02-15-2022 06:44 AM

Correct answer

(R+S+P)=1/15

S+P = 1/15-R

(R+S+P)5 + (S+P)20 = 1

5R + 5S+ 5P +20S +20P = 1

5R + 25S + 25P = 1

5R + 25 (S+P) = 1

5R +25 (1/15-R) = 1

5R +25/15-25R=1

25/15-20A=1

5/3-20A=1

5/3-1=20A

2/3=20A

2=60A

2/60=A

.''.A=1/30

A=30days


Prasath 02-15-2022 06:44 AM

Correct answer

(R+S+P)=1/15

S+P = 1/15-R

(R+S+P)5 + (S+P)20 = 1

5R + 5S+ 5P +20S +20P = 1

5R + 25S + 25P = 1

5R + 25 (S+P) = 1

5R +25 (1/15-R) = 1

5R +25/15-25R=1

25/15-20A=1

5/3-20A=1

5/3-1=20A

2/3=20A

2=60A

2/60=A

.''.A=1/30

A=30days


Prasath 02-15-2022 06:42 AM

Correct answer

30 days is the correct answer

Prasath 02-15-2022 06:07 AM

Wrong Answer

I think the right answer is 60


Sourav S Kashyap 08-27-2021 01:42 PM

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