Source: Official Guide for the GMAT 13th Ed. Problem Solving; #199 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #199

▲
1

0.99999999/1.0001-0.99999991/1.0003=

0.99999999/1.0001-0.99999991/1.0003=

2 Explanations

▲
1

Delia Wang

You could also express each fraction as a subtraction of some small number from 1, giving you - 10001/100010000 + 30009/100030000 = 3/10000 - 1/10000 = 2/10000.

Jun 11, 2017 • Comment

▲
1

Gravatar Mike McGarry, Magoosh Tutor

Dec 28, 2013 • Comment

Sergey Volchematiev

You could have used the same trick of the squares difference in the second fraction as well.

Nov 2, 2014 • Reply

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Nova's GRE Prep

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 5.3 Problem Solving

Section 5.3 Problem Solving

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post

Email

Facebook

Return to Forum