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Yas ortalamasi 35 olan 5 kişilik bir aile varmış baba çıkınca yaş ortalamasi 18 oluyor, baba kaç yaşındadır?

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Veydaerans
baba’ya b diyelim.
(a+b+c+d+e) /5= 35
(a+c+d+e) /4= 18
———
a+b+c+d+e = 175
a+c+d+e = 72 (usttekinde yerine yazalim)
b+72=175
b= 103 yasindaymis.
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