Sagot :
Cevap:
27
Adım adım açıklama:
Sayıya 9x dersek;
(9X * 5)/9 =5X
(9X *2)/9 = 2X
toplamları 21 ise ;
5x+2x=21
7x=21
x=3
Sayıya biz 9x demiştik .x ise 3 olarak bulundu.
9*3 = 27
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