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Pls explain

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Junior | Next Rank: 30 Posts
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Joined: Mon Nov 26, 2007 7:14 pm
by mollyrg » Thu Jan 24, 2008 11:14 am
Q: The base of a rectangular block has area 60 sq.cm. Is the block a cube?

1. The area of the front face of the block is 60 sq.cm
2. The area of the side face of the block is 60 sq.cm

I think ans shud be d
But the actual ans is c

Pls explain

Thanx,
molly
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Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
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by cris » Thu Jan 24, 2008 12:28 pm
Molly it cant be D: imagine that the block is a rectangle w=3 and l=20 (3*20=60). Then imagine that it is a square so both sides= 2squareroot(15)

1) w= 3 and the hight=20, [and 3*20=60]----->is NOT a SQUARE

But if w=2squareroot(15) and high=2squareroot(15) [and (2squareroot15)^2)=60]------> is a SQUARE

Hence this statement is INSUFF.

And teh same examples work for statement 2.

You got it molly?
Last edited by cris on Thu Jan 24, 2008 2:26 pm, edited 1 time in total.
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Junior | Next Rank: 30 Posts
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Joined: Mon Nov 26, 2007 7:14 pm

gottit..Thankyou

by mollyrg » Thu Jan 24, 2008 1:16 pm
gottit.. Thankyou..
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