MGMAT Guide: Rates : GMAT Quantitative Section
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# MGMAT Guide: Rates

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01 Apr 2012, 08:04
Hi,

Has someone studied the Rates chapter of the Manhattan Guide?, Is it useful?

I have read it very fast and I think that makes this topic complicated, while it is very simple.
I think that it is just important to know some basic formulas. Period. However, they use charts that I have never used in my life!

Please, give me your feedback to confirm whether I should study or skip it.

Thank you!
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01 Apr 2012, 14:45
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It is crucial to study rates and work; it is so much tested. The charts and RTD strategies of MGMAT are great to get yourself to think in a structured way. With practice, you will set up charts much more quickly but you will keep the structured approach in mind.

Best of luck

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01 Apr 2012, 16:33
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metallicafan wrote:
Hi,

Has someone studied the Rates chapter of the Manhattan Guide?, Is it useful?

I have read it very fast and I think that makes this topic complicated, while it is very simple.
I think that it is just important to know some basic formulas. Period. However, they use charts that I have never used in my life!

Please, give me your feedback to confirm whether I should study or skip it.

Thank you!

What I liked about their chart approach is that it is definitely helpful once the problems get harder
with Multiple RTDs (p35-39 for example)...
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02 Apr 2012, 12:03
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I read it, but also don't use the charts for rate problems. I think it might be helpful, if you prefer a more structured approach, but basically you just have three variables for one or more objects with which to work with. Drawing a table for this seems to be a little too time consuming.
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03 Apr 2012, 00:28
metallicafan wrote:
Hi,

Has someone studied the Rates chapter of the Manhattan Guide?, Is it useful?

I have read it very fast and I think that makes this topic complicated, while it is very simple.
I think that it is just important to know some basic formulas. Period. However, they use charts that I have never used in my life!

Please, give me your feedback to confirm whether I should study or skip it.

Thank you!

You need to know only two things to solve any rates problem:
1. Rates are additive (not time) - e.g. if A's speed is 1/2 work per hr and B's speed is 1/3 work per hr, together they do (1/2 + 1/3) work per hr.
Instead if we know that A does the work in 2 hrs and B does it in 3 hrs, they DO NOT take 5 hrs together! (obviously!)
2. Work = Rate*Time
If they do 1 work, then Rate is inverse of time (Say if A takes 3 hrs to complete a work, his rate is 1/3)
If they are working together, use their combined rate in the formula (since you can add rates)
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03 Apr 2012, 06:16
Truth be told I found the chapter confusing. My MGMAT teacher had a handout for it which he created and it absolutely simplified the chapter.
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04 Apr 2012, 08:35
wallstreetbarbie wrote:
Truth be told I found the chapter confusing. My MGMAT teacher had a handout for it which he created and it absolutely simplified the chapter.

Any chance we can get a copy of that handout?

I find rate problems to be rather difficult.
Re: MGMAT Guide: Rates   [#permalink] 04 Apr 2012, 08:35
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