# Math prob

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Silly question but....

how do you find x

1/2 = 40/x

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1. Multiply both sides of the equation by x to get the variable out of the denominator.

x/2 = 40

2. Multiply both sides of the equation by 2 to get the x all by itself

x = 80

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1/2 = 40/x <- it's right there

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You use cross-multiplication:
1(x) = 40(2) == x = 80.

@Nypyren Classic.

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OneThreeThreeSeven,

Given the answer that someone else gave you here, can you now show us how to solve the following for x?

1/2 = 40/(2 + 3x/2)

Thank you!

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Quote:
 Original post by OneThreeThreeSevenSilly question but....how do you find x1/2 = 40/x

1/2 = 40/ x

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Quote:
Original post by sooner123
Quote:
 Original post by OneThreeThreeSevenSilly question but....how do you find x1/2 = 40/x

1/2 = 40/ x

[smile]

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http://www.wolframalpha.com/input/?i=1/2+%3D+40/x
http://www.wolframalpha.com/input/?i=1/2+%3D+40/(2+%2B+3x/2)

Gotta love wolfram alpha :)

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Quote:
 Original post by incinhttp://www.wolframalpha.com/input/?i=1/2+%3D+40/xhttp://www.wolframalpha.com/input/?i=1/2+%3D+40/(2+%2B+3x/2)Gotta love wolfram alpha :)

Wow, yes...yes that is awesome.

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1/2 = 40/x

2 is 2 times the amount of 1, then that means from above x needs to be 2 times the amount of 40,so x = 2*40 = 80. Thus x = 80.

[Edited by - Concentrate on December 14, 2010 3:45:26 PM]

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