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2014-11-12T19:52:43+02:00
F + b = 28
f = 40% x b

40% x b + b = 28
b x ( 1 + 40% ) = 28
b x ( 100/100 + 40/100 ) = 28
b x 140/100 = 28
b = ( 28 x 100 ) / 140
b = 2800 / 140
b = 20

f = 20 x 40/100 = 800 / 100 = 8

Verificare      20 + 8 = 28