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A, B and C can do a work in 5 days, 10 days and 15 days respectively.

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Manager
Joined: 28 Feb 2003
Posts: 99

Kudos [?]: 11 [0], given: 0

A, B and C can do a work in 5 days, 10 days and 15 days respectively. [#permalink]

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15 May 2003, 18:30
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Difficulty:

45% (medium)

Question Stats:

50% (00:25) correct 50% (00:53) wrong based on 10 sessions

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A, B and C can do a work in 5 days, 10 days and 15 days respectively. They started together to do the work but after 2 days A and B left. C did the remaining work in how many days.

(A) 6
(B) 3
(C) 5
(D) 4
[Reveal] Spoiler: OA

Kudos [?]: 11 [0], given: 0

Manager
Joined: 28 Feb 2003
Posts: 99

Kudos [?]: 11 [0], given: 0

Re: A, B and C can do a work in 5 days, 10 days and 15 days respectively. [#permalink]

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15 May 2003, 18:45
perfect

Kudos [?]: 11 [0], given: 0

SVP
Joined: 03 Feb 2003
Posts: 1603

Kudos [?]: 308 [0], given: 0

Re: A, B and C can do a work in 5 days, 10 days and 15 days respectively. [#permalink]

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16 May 2003, 00:25
a share of work + another share = all work

2*(1/5+1/10+1/15)+X*1/15=1
X=4

Kudos [?]: 308 [0], given: 0

Director
Joined: 01 Feb 2011
Posts: 725

Kudos [?]: 146 [0], given: 42

Re: A, B and C can do a work in 5 days, 10 days and 15 days respectively. [#permalink]

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15 Apr 2011, 15:09

Posted from my mobile device

Kudos [?]: 146 [0], given: 42

TOEFL Forum Moderator
Joined: 16 Nov 2010
Posts: 1602

Kudos [?]: 600 [0], given: 40

Location: United States (IN)
Concentration: Strategy, Technology
Re: A, B and C can do a work in 5 days, 10 days and 15 days respectively. [#permalink]

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15 Apr 2011, 20:49
1/5 + 1/10 + 1/15 part of work is done in one day

So in 2 days -> 2(1/5 + 1/10 + 1/15) part of work is done

Part remaining = 1 - 2(1/5 + 1/10 + 1/15)

= ( 1 - 2(6 + 3 + 2 /30))

= (15 - 11)/15

= 4/15

So C does it in -> 4/15* 1/15 (Rate * Time = Work => Time = Work/Rate)

= 4 days

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Kudos [?]: 600 [0], given: 40

Re: A, B and C can do a work in 5 days, 10 days and 15 days respectively.   [#permalink] 15 Apr 2011, 20:49
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