Aptitude - Time and Work - Discussion

Discussion Forum : Time and Work - Data Sufficiency 1 (Q.No. 1)
Directions to Solve

Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and

  • Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
  • Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
  • Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
  • Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
  • Give answer(E) if the data in both Statements I and II together are necessary to answer the question.

1.

A and B together can complete a task in 7 days. B alone can do it in 20 days. What part of the work was carried out by A?

I. 

A completed the job alone after A and B worked together for 5 days.

 II. 

Part of the work done by A could have been done by B and C together in 6 days.

I alone sufficient while II alone not sufficient to answer
II alone sufficient while I alone not sufficient to answer
Either I or II alone sufficient to answer
Both I and II are not sufficient to answer
Both I and II are necessary to answer
Answer: Option
Explanation:

B's 1 day's work = 1
20

(A+ B)'s 1 day's work = 1
7

 I. (A + B)'s 5 day's work = 5
7

Remaining work = 1 - 5 = 2 .
7 7

2 work was carried by A.
7

II. is irrelevant.

Correct answer is (A).

Discussion:
20 comments Page 2 of 2.

Bineeta said:   8 years ago
Why not E?

We required statement II also for solving the equation. Please explain me.
(1)

Manju p said:   8 years ago
How to find "x "when ((x÷15)+(5÷10))=1 is given.

Please tell me.

VISITHRA. S said:   8 years ago
How "Remaining work =1-5" is done? Not understood please explain.
(1)

Munna said:   1 decade ago
How we get 5/7 and 1-5/7=2/7 how it is possible tell me friend?

Deepa said:   1 decade ago
Why we have calculated only for 5 days it may be 6 days too. ?

Akshay said:   9 years ago
@Ankush.

Agree with you, even I got the same answer.

Singh said:   1 decade ago
Ankush you are genious yaar. You are 100% correct.

Pihu said:   9 years ago
@Ankush.

How you got 28? please explain.

Lakshminarayana said:   10 years ago
Please explain deep I can't understand.

Nabanita Biswas said:   8 years ago
From where we get 5?


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