Ratio DS

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okigbo: Master | Next Rank: 500 Posts; Posts: 177; Joined: Sun Aug 02, 2009 9:39 pm; Thanked: 6 times

by okigbo » Wed Oct 21, 2009 11:51 pm

20) If m, r, x & y are positive, is the ratio of m to r equal to the ratio of x to y?
a. Ratio of m to y is equal to ratio of x to r
b. Ratio of m + x to r + y equals ratio of x to y

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Source: Beat The GMAT — Data Sufficiency | Wed Oct 21, 2009 11:51 pm

xcusemeplz2009: Master | Next Rank: 500 Posts; Posts: 399; Joined: Wed Apr 15, 2009 3:48 am; Location: india; Thanked: 39 times

by xcusemeplz2009 » Thu Oct 22, 2009 2:29 am

IMO B

It does not matter how many times you get knocked down , but how many times you get up

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crackgmat007: Legendary Member; Posts: 882; Joined: Fri Feb 20, 2009 2:57 pmFollowed by: 1 member; Thanked: 15 times; GMAT Score:690

Re: Ratio DS

by crackgmat007 » Fri Oct 23, 2009 11:43 am

okigbo wrote:20) If m, r, x & y are positive, is the ratio of m to r equal to the ratio of x to y?
a. Ratio of m to y is equal to ratio of x to r
b. Ratio of m + x to r + y equals ratio of x to y

Rephrase

m/r = x/y, which is nothing but, my=xr.

1. States that mr=xy, doesnt match our rephrase
2. States that (m+x)/(r+y) = x/y. Solving we get, my + xy = xr + xy. Cancelling xy on both sides, we get our rephrase.

Hence B.

HTH

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