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2014-04-29T23:04:35+03:00
A/b=2/3 ⇒3a=2b ⇒a=2b/3
2a+b=140
inlocuim si avem
4b/3+b=140
(4b+3b)/3=140⇒  7b/3=140
b=140·3/7
b=60
a=2·60/3
a=40