Test Code 52, section 4, question 13

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irfan_m1973: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Fri Nov 13, 2009 6:27 amFollowed by: 1 member

by irfan_m1973 » Mon Dec 07, 2009 1:46 am

Of the four numbers represented on the number line above, is r closest to zero?

(1) q = -s

(2) -t< q

OA is A. pls explain

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Source: Beat The GMAT — Data Sufficiency | Mon Dec 07, 2009 1:46 am

Testluv: GMAT Instructor; Posts: 1302; Joined: Mon Oct 19, 2009 2:13 pmFollowed by: 164 members; Location: Toronto; Thanked: 539 times; GMAT Score:800

by Testluv » Mon Dec 07, 2009 2:00 am

(1) q = -s

This tells us that q and s are on opposite sides of zero, and that they are each equidistant from zero. For example, if q = -2, then s = 2. Then, r is clearly the variable that is closest to zero. In fact, if we assume that the distance between each letter is equal (which "looks" to be the case), then r IS zero.

Sufficient.

(2) -t< q

Then, either r or s can be closest to zero.

Insufficient.

The first statement is sufficient by itself while the second one is not.

Choose A.

Kaplan Teacher in Toronto

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papgust: Community Manager; Posts: 1537; Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members; Thanked: 653 times

by papgust » Mon Dec 07, 2009 2:02 am

1. q = -s. which means that q is a negative of s.

i.e. q+s = 0

if q = -3, s = 3, q+s = -3+3 = 0
if q = -5, s = 5, q+s = -5+5 = 0
.
.

Now coming to the prob, r is placed in between q and s. In the number line, 0 is in between negatives and positives. r is in between a negative and a positive. So, among the four values (q,r,s,t), r is the closest to 0.

Sufficient.

2. -t<q

q + t > 0. This gives us no useful information to determine whether r is closest to 0 or not.

Insufficient.

Hence A.

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

by mehravikas » Tue Dec 08, 2009 4:48 pm

Is this question from GMAT Paper test?

irfan_m1973 wrote:

Of the four numbers represented on the number line above, is r closest to zero?

(1) q = -s

(2) -t< q

OA is A. pls explain

Like this post

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