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which statements is necessary for answer this question
Q: How long would A takes to complete the work?
statement 1: A and C working together, take 30 days to do the work
statement 2:A,B and C working together and finish the work in 20 days
statement 3: B is two times more efficient than C
A)All three statements
B)Statements 1and3
C)Statements 2and3
D)statements 1and2
Read Solution (Total 3)
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- (A+B+C)'s 1 day work = 1/20
(A+C)'s 1 day work = 1/30
B's 1 day work = (A+B+C)-(A+C) = 1/20-1/30 = 10/600 = 1/60
B alone ll finish the work in 60 days
From (1) and (2), we can find the no. of days taken to complete by B alone
In order to find A's 1 day work, (3) is also needed
Statement 3: Time taken by B:C => B:2B
C's 1 day work = 2*60= 120 days
(B+C)'s 1 day work = 1/60+1/120 => 180/7200 => 1/40
A's 1 day work = (A+B+C)'s 1 day work - (B+C)'s 1 day work => 1/20-1/40 =
=>20/800
A's 1 day work = 1/40
A ll complete the work in 40 days
Hence all the 3 statements are needed to find A's no. of days
Ans : (A) All three statements - 10 years agoHelpfull: Yes(29) No(0)
- a> is the correct option
- 10 years agoHelpfull: Yes(2) No(1)
- All three statements are necessary.
- 8 years agoHelpfull: Yes(1) No(0)
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