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Geek Culture / Need math help!

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DJ Almix
19
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Joined: 25th Feb 2006
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Posted: 14th Nov 2010 22:39 Edited at: 14th Nov 2010 22:41
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I feel so dumb being able to not answer this:

if 2/3 is 1/2 of 4/5 of a certain number, then that number is?

Answer: (B) 5/3

Ideas?

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RalphY
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Joined: 6th Sep 2004
Location: 404 (UK)
Posted: 14th Nov 2010 22:50 Edited at: 14th Nov 2010 22:50
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2/3 = 0.67 which is 1/2 of 4/5 of the number, so:
4/5 of the number = 0.67 * 2 = 1.34

1/5 of the number would be:
1.34 / 4 = 0.34 = 1/5 so the number is:

5/5 of the number = the number = 0.34 * 5 = 1.7 = 5/3

Go banana! | Super Nintendo Chalmers! | When I grow up I'm going to Bovine University!
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Astro Chickster
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Posted: 15th Nov 2010 05:50
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Beat at Maths by the dumbest kid in Springfield.
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Fatal Berserker
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Posted: 16th Nov 2010 20:11
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Quote: "Beat at Maths by the dumbest kid in Springfield."

I think we can agree that Homor is more stupid, and it is questionable if he has matured into adulthood yet.

Smoke me a kipper, ill be back for breakfast.

MMORPG -- Many Men Online Role Playing as Girls

G.I.R.L -- Guy In Real Life
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PAGAN_old
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Joined: 28th Jan 2006
Location: Capital of the Evil Empire
Posted: 16th Nov 2010 21:32
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i tried reading that against my will my head almost exploded and reminded me of that nightmare i had today that i was back in highschool senior year (the worst year considering its the last year and you cant wait to get out of highschool.)

dont hate people who rip you off,cheat and get away with it, learn from them
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IanM
Retired Moderator
22
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Joined: 11th Sep 2002
Location: In my moon base
Posted: 17th Nov 2010 14:37
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Sounds like homework about fractions to me.

Quote: "if 2/3 is 1/2 of 4/5 of a certain number, then that number is?"

That's the same as saying:
2/3 = 1/2 x 4/5 x X

which can be rearranged as:
2/3 / 1/2 / 4/5 = X

Then you can simply carry out the division on the left hand side to get the value of X - no need to convert to decimal at all.

Utility plug-ins (26-JUL-2010)
I'm applying terms of use that require you to wear a red nose and honk a horn whenever you use the Internet
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DeadTomGC
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Location: LU
Posted: 20th Nov 2010 05:52
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Would anyone Like to post the proof for FTC or the Fundamental theorem of Calculus?

[url="http://www.armchairempire.com/"][/url]
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