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Three rugs have a combined area of 200 square meters. By overlapping t [#permalink]

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06 Oct 2010, 06:08

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Three rugs have a combined area of 200 square meters. By overlapping the rugs to cover floor area of 140 square meters, the area that is covered by exactly two layers of rug is 24 square meters. What is the area that is covered with three layers of rug ?

A. 18 square meters B. 20 square meters C. 24 square meters D. 28 square meters E. 30 square meters

Three rugs have a combined area of 200 square meters. By overlapping the rugs to cover floor area of 140 square meters, the area that is covered by exactly two layers of rug is 24 square meters. What is the area that is covered with three layers of rug ?

A. 18 square meters B. 20 square meters C. 24 square meters D. 28 square meters E. 30 square meters

Total = Rug1 + Rug2 + Rug3 - {overlap of exactly 2 rugs} - 2*{overlap of exactly 3 rugs}

140 = 200 - 24 - 2*{overlap of exactly 2 rugs} --> {overlap of exactly 3 rugs} = 18.

Re: Three rugs have a combined area of 200 square meters. By overlapping t [#permalink]

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06 Oct 2010, 11:03

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Bunuel wrote:

pzazz12 wrote:

Three rugs have a combined area of 200 square meters. By overlapping the rugs to cover floor area of 140 square meters, the area that is covered by exactly two layers of rug is 24 square meters. What is the area that is covered with three layers of rug ?

A. 18 square meters B. 20 square meters C. 24 square meters D. 28 square meters E. 30 square meters

Total = Rug1 + Rug2 + Rug3 - {overlap of exactly 2 rugs} - 2*{overlap of exactly 3 rugs}

140 = 200 - 24 - 2*{overlap of exactly 2 rugs} --> {overlap of exactly 3 rugs} = 18.

WE: Information Technology (Internet and New Media)

Re: Three rugs have a combined area of 200 square meters. By overlapping t [#permalink]

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13 Nov 2010, 12:15

Hi,

MGMAT advocates using Venn diagrams for triple sets ... I have no idea how to do this with Venn diagrams... can someone please help me?

Thinking in Venn diagram terms here:

I thought there are actually 3 pairs of 2 overlapping rug areas in this question (r1 overlapping r2, r2 overlapping r3, r1 overlapping r3) and not 2? So shouldnt it be 3*24 to count all double overlaps?

MGMAT advocates using Venn diagrams for triple sets ... I have no idea how to do this with Venn diagrams... can someone please help me?

Thinking in Venn diagram terms here:

I thought there are actually 3 pairs of 2 overlapping rug areas in this question (r1 overlapping r2, r2 overlapping r3, r1 overlapping r3) and not 2? So shouldnt it be 3*24 to count all double overlaps?

And, isn't there only 1 overlap of all 3 rugs!?

Sorry but I'm thoroughly confused here

Thanks

Venn Diagram: I have given a letter to each region to clarify.

Attachment:

Ques1.jpg [ 16.36 KiB | Viewed 5856 times ]

Rug 1 + Rug 2 + Rug 3 = 200 (a + x + y + k) + (b + x + k + z) + (c + y + k + z) = 200

But area of floor covered is only 140 i.e. if each section is counted only once a + b + c + x + y + z + k = 140 Subtracting second equation from first, x + y + z + 2k = 60 But x + y + z (Area with two layers of rug) = 24 So 2k = 36 or k = 18 This is how it can be done using a venn diagram.

Note: You obviously wouldn't need to make all these equations and can directly jump to x + y + z + 2k = 60 but I wrote them down for clarity. It is really hard to say 'Section of Rug 1 which is in single layer..section of rug 2 in two layers etc'
_________________

actually - how would you jump directly to x + y + z + 2k = 60 without writing the equations?

It is again a matter of thinking vs solving. If I think more, I have to solve less. Combined area of rugs is 200 sq m while area of floor they cover is only 140 sq m. So what does the extra 60 sq m do? It covers another rug! Wherever there are two rugs overlapping, one rug is not covering the floor but just another rug. Wherever there are three rugs overlapping, two rugs are not covering the floor but just the third rug at the bottom. so can I say that x + y + z is the area where one rug is covering another rug and k is the area where two rugs are covering another rug? or put another way, can I say x + y + z + 2k = 60?

This entire 'thinking process' takes ten seconds once you are comfortable with it and your answer would be out in 30 sec flat!
_________________

Re: Three rugs have a combined area of 200 square meters. By overlapping t [#permalink]

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18 Jun 2015, 00:00

I am new here from Melbourne, Australia and trying to solve as many questions as I can for my test. I am looking or more rugs type questions.
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Re: Three rugs have a combined area of 200 square meters. By overlapping t [#permalink]

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