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anon

Post subject: Guide 4 Foundations of Math Ch. 8 Drill 3. Drill 3. #2. Posted: Thu Dec 22, 2011 2:56 pm 


Course Students 

Posts: 15

Drill 3: Solve the following inequalities.
2. x/3 +8 < x/2
In the answer it multiplies both sides by 6 to cancel out the bottom fractions. Can you please explain? When I solve the problem I multiply the 3 on both sides to cancel out the three and then multiply by 2 on both sides to cancel out the fraction on the right side. I see why the 6 was used since they both multiply by 6. What I don't see if how I can recognize when to multiply by a number that's not already in the problem while knowing it's still an approved number and not something that's changing the equation. Thanks!





tim

Post subject: Re: Guide 4 Foundations of Math Ch. 8 Drill 3. Drill 3. #2. Posted: Sat Dec 31, 2011 1:49 pm 


ManhattanGMAT Staff 

Posts: 4994 Location: Southwest Airlines, seat 21C

You can totally multiply by 3 and by 2. That does the same thing as multiplying by 6. You save yourself a few seconds if you recognize this and just start with the 6, but your method is totally fine as well..
_________________ Tim Sanders Manhattan GMAT Instructor





