Diane find 2 and a half cans of paint are just enough to

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Diane find 2 and a half cans of paint are just enough to [#permalink]

16 Feb 2013, 12:40

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54% (01:35) correct

46% (00:50) wrong

based on 9 sessions

Diane find 2 and a half cans of paint are just enough to paint one third of her room. How many more cans of paint will she need to finish her room and paint a second room of the same size?

A. 5
B. 7 and a half
C. 10
D. 12 and a half
E. 15

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Re: Diane find 2 and a half cans of paint are just........ [#permalink]

16 Feb 2013, 22:27

She will need 5 cans to paint the rest of this room and seven and a half for the next room for a total of twleve and half cans.

D it is.
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Re: Diane find 2 and a half cans of paint are just........ [#permalink]

18 Feb 2013, 21:10

antoxavier wrote:

Notice that for 1/3 of a room, she used 2.5 cans.
For 2 full rooms (i.e. 6 times the initial work), she will need a total of 2.5 * 6 = 15 cans

So she needs 15 - 2.5 = 12.5 more cans to finish her room and paint another room of the same size.
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Director

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Joined: 24 Jul 2011

Posts: 504

GMAT 1: 780 Q51 V48

GRE 1: 1540 Q800 V740

Followers: 37

Kudos [?]: 159 [0], given: 9

Re: Diane find 2 and a half cans of paint are just enough to [#permalink]

04 Mar 2013, 21:56

Other questions based on the unitary method:

if-sally-can-paint-a-house-in-4-hours-and-john-can-paint-141777.html
lindsay-can-paint-1-x-of-a-certain-room-in-20-minutes-what-59488.html
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Re: Diane find 2 and a half cans of paint are just enough to [#permalink] 04 Mar 2013, 21:56

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Diane find 2 and a half cans of paint are just enough to

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