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- Video Course
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- General GRE Info and Strategies - 7 videos (free)
- Quantitative Comparison - 7 videos (free)
- Arithmetic - 42 videos
- Powers and Roots - 43 videos
- Algebra and Equation Solving - 78 videos
- Word Problems - 54 videos
- Geometry - 48 videos
- Integer Properties - 34 videos
- Statistics - 28 videos
- Counting - 27 videos
- Probability - 25 videos
- Data Interpretation - 24 videos
- Analytical Writing - 9 videos (free)
- Sentence Equivalence - 39 videos (free)
- Text Completion - 51 videos
- Reading Comprehension - 16 videos

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## Comment on

Bit of Everything## Hello, I am a little confuse.

## The rule, 1/(a/b) = b/a, is

The rule, 1/(a/b) = b/a, is correct, but we don't have a 1/(a/b) situation here.

I'm using the fact that (a/b)/(c/d) = (a/b) x (d/c)

## Great, I was confused.Thanks

## hello why did you multiply?

## When dividing by a fraction,

When dividing by a fraction, we multiply by the reciprocal.

That is: a/b ÷ c/d = a/b x d/c

So, for example: 2/3 ÷ 8/11 = 2/3 x 11/8

Likewise, (3/4)/(2/5) = (3/4)(5/2)

So, in the video solution, we have (16^something)/(1/27^something)

Applying the rule for dividing by fractions, we get:

(16^something)/(1/27^something) = (16^something)(27^something/1)

= (16^something)(27^something)

More here: https://www.greenlighttestprep.com/module/gre-arithmetic/video/1069

Does that help?

Cheers,

Brent

## yes, thank you!!

## I GOT THIS RIGHT!! yay! I

Thank you Brent! These video lessons and practice questions are so useful!

## Nice work! Keep at it!!

Nice work! Keep at it!!

Cheers,

Brent

## So I thought it was B, but