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Thread: Do numbers lie, redux

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02-21-2013, 07:25 PM

Arctic Fox Arctic Fox is offline

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Do numbers lie, redux

let X+Y=Z

multiply both sides by four:
4X+4Y=4Z

and by five:
5Z=5X+5Y

add the two:
4X+4Y+5Z=5X+5Y+4Z

subtract 9Z from each side:
4X+4Y-4Z=5X+5Y-5Z

thus:
4(X+Y-Z)=5(X+Y-Z)

divide both sides by (X+Y-Z):
4=5