Math Comparison Question

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Discus: SAT/ACT Tests and Test Preparation: May 2004 Archive: Math Comparison Question
 By Valk78 (Valk78) on Friday, April 30, 2004 - 05:45 pm: Edit

Hey im having trouble with the following Question in the Quantative Comparison Section.. All of these types of questions give me trouble..

PW
-WP
----
72

which is larger, P or w (quantative comparison section) I have a problem with all of these variable questions just like this, if anyone has a method of doing them youll be my savior, thanks

 By Valk78 (Valk78) on Friday, April 30, 2004 - 06:02 pm: Edit

the PW,WP, and 72 are lined up

 By Inopa (Inopa) on Friday, April 30, 2004 - 06:27 pm: Edit

its 91-19...so P is greater?

 By Kousuke (Kousuke) on Friday, April 30, 2004 - 06:32 pm: Edit

you know that:
(10P+W)-(10W+P)=72

P-W=8

so P is 8 greater than W.
P is larger.

by the way P=9, W=1

also you could have looked at it and noticed that if W were greater than P your answer would have to be negative. but your answer is positive, so it would be impossible for W to be greater than P leaving you with P is greater than W.

 By Neophyte31 (Neophyte31) on Friday, April 30, 2004 - 06:55 pm: Edit

the answer is D. Since 72 is only 3 digits, that means that W+P can only equal 1 digit. There is no combination of Ws and Ps that can result in 72.

 By Lisasimpson (Lisasimpson) on Friday, April 30, 2004 - 07:04 pm: Edit

huh??

 By Kousuke (Kousuke) on Friday, April 30, 2004 - 07:32 pm: Edit

72 is 2 significant figures my friend, and the question isnt P*W-W*P, if it were it would always have to equal 0, the question is P as the tens digit W as the singles digit, minus, W as the tens digit P as the sigles digit. sorry neophyte youre taking one question turning it into another and then making it more confusing and incorrect than it was meant to be.

 By Valk78 (Valk78) on Friday, April 30, 2004 - 09:30 pm: Edit

thanks : )

 By Neophyte31 (Neophyte31) on Saturday, May 01, 2004 - 01:23 am: Edit

whoops. my bad. i was thinking PW + WP.