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resilient: Legendary Member; Posts: 789; Joined: Sun May 06, 2007 1:25 amFollowed by: 6 members; Location: Southern California, USA; Thanked: 15 times

by resilient » Thu Feb 07, 2008 8:00 pm

on the formula V= 1/(2r)^3, if r is halved, then V is mutliplied by?

a. 64
b.8
c.1
d.1/8
e.1/64

I plugged in numbers yet got lost in the math..any help?

qa is b

Appetite for 700 and I scraped my plate!

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Source: Beat The GMAT — Problem Solving | Thu Feb 07, 2008 8:00 pm

Saffa: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Thu Jul 12, 2007 1:16 am; Location: Cape Town South Africa; Thanked: 5 times

by Saffa » Fri Feb 08, 2008 3:07 am

One way of going about it is set r = 1

then V = 1/(2x1)^3 = 1/2^3 = 1/8

set r= 1/2

V = 1/(2 x 1/2)^3 = 1/1^3 = 1/1 = 1

Thus V is multiplied by 8: 1/8 x 8 = 1

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