testing header
Math Goodies is a free math help portal for students, teachers, and parents.
Free Math
Interactive Math Goodies Software

Buy Math Goodies Software
testing left nav
Math Forums @ Math Goodies
Math Forums @ Math Goodies
Home | Profile | Active Topics | Members | Search | FAQ
Save Password
Forgot your Password?

 All Forums
 Homework Help Forums
 Standardized Test Preparation Help
 Operations on Rational numbers
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Joe Komagawa
Average Member

11 Posts

Posted - 12/01/2013 :  01:10:56  Show Profile  Reply with Quote
GMAT-the official guide, #174
(box triangle)(triangle)(box)= box, triangle box
the product of 2 digit numbers above is the 3 digit number "box-diamond-box" where box, diamond, triangle are nonzero digits. If (box)(triangle) <10, what is the 2 digit number box-triangle?
A) 11, B) 12, C) 13, D)21, E) 31 Answer: D) 21
OK, the key in the answer is to know that triangle= 1, and I don't see ( and 2 smarter friends don't see how this conclusion is brought about.

Where does "(box)(triangle) = box " come from in this deductive process? and the rest of the explanation,
"Notice that the hundreds digit in the solution is the same as the hundreds digit of the second partial product, so there is no carrying over from the 10s column. this means that "diamond<10 and since diamond=(box)(box)+1".... Help!

THANKS FOLKS! , I spent about 2 months of squeezing my tiny brain over these 176 problems. There is 1 more but I didn't include it here. I think I am testing your patience. BUT, really I have really really tried to work alll these by myself,and in addition I have gone back over the problems I muddled through, in some cases several times. to try to get the thinking of the mathematical way.
Regards from Starbucks in Saitama Japan,
Go to Top of Page

Advanced Member

299 Posts

Posted - 12/01/2013 :  12:07:40  Show Profile  Reply with Quote
I have no idea what you mean. You need to be more specific about 'box triangle', etc.
Go to Top of Page

Joe Komagawa
Average Member

11 Posts

Posted - 12/01/2013 :  18:32:18  Show Profile  Reply with Quote
I mean draw a box/square, diamond, triangle. they are symbols.. Draw them in the order I have written.
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Math Forums @ Math Goodies © 2000-2004 Snitz Communications Go To Top Of Page
This page was generated in 0.04 seconds. Snitz Forums 2000
testing footer
About Us | Contact Us | Advertise with Us | Facebook | Blog | Recommend This Page

Copyright © 1998-2014 Mrs. Glosser's Math Goodies. All Rights Reserved.

A Hotchalk/Glam Partner Site - Last Modified 18 Dec 2014