### Mathematics Rate Formulas

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- a / b = c / d => ad = bc

=> a = bc / d

=> b = ad / c

- a / c = b / d ; d / b = c / a ; d / c = b / a

a ± b / b = c ± d / d ;

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- a + b / a – b = c + d / c – d;

a ± b / a = c ± d / c ;

- a / a ± b = c / c ± d; b / a ± b = d / c ± d

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