46) How many m^2

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ern5231: Master | Next Rank: 500 Posts; Posts: 226; Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Wed May 12, 2010 12:36 am

Given that 100cm = 1m. How many m^2 would equal 200 cm ^ 2?

I picked this question from an online question bank. Unfortunaltely, it does not options to it.

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Source: Beat The GMAT — Problem Solving | Wed May 12, 2010 12:36 am

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed May 12, 2010 1:08 am

ern5231 wrote:Given that 100cm = 1m. How many m^2 would equal 200 cm ^ 2?

I picked this question from an online question bank. Unfortunaltely, it does not options to it.

The simple unitary method taught in junior classes, and a little bit about the dimensional analysis learnt in high school has key to many such situations on real test, sometimes. So, it's very important to ponder, one more time.

If 100 cm = 1 m,

then 100^2 cm^2 = 1^2 m^2

or 10000 cm^2 = 1 m^2

hence 1 cm^2 = 1/10000 m^2 (here's the unitary method trick)

and hence 200 cm^2 = 200/10000 m^2 = [spoiler]1/50 m^2 or 0.02 m^2[/spoiler].

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
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www.manyagroup.com

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