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A1=35u %A1=? => %A1=x
A2=37u %A2=? => %A2=100%-x
Ar=(A1*%A1+A2*%A2):100% <= wzór na średnią ważoną
35,45=[35*x+37*(100%-x)]:100% /*100%
3545%=35x+3700%-37x
3545%-3700%=-2x
-2x=-155% /:(-2)
x=77,5%=%A1
%A2=100%-x=100%-77,5%=22,5%