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2014-07-26T21:33:43+05:30

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A + B = 2x    then A and B complements of each other in a total of 2x

Let      B = 40% of  2x    = (40 / 100) * 2 x  = 0.8 x
then  A =   60%  of 2x      as both percentages will add to 100%
             =  (60/100)  * 2x  =  1.2 x
You verify by adding A & B. They will total to  2x.

we have   A  =  10.      Then  1.2 x  = 10      Then  x = 10/1.2 = 100/12 = 8.333....
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