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2014-11-11T12:17:25+02:00
stim (a+b+c)/3 =20

stim (a+b)/2=24 => b=48-c:4
stim a=c:4
inlocuim pe a si b in prima relatie
(c:4+48-c:4+c)/3 =20  => c=20*3-48=12

a=c:4=12:4=3
b=48-c:4=48-12:4=45
poti face proba
3+45+12=60 , 60/3=20  adevarat
3+45=48 , 48/2=24 adevarat

bafta !





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