wiek MARKA ----x
WIEK OJCA ---3x
wiek mamy --- 3x - 4
x + 3x + 3x - 4 = 87
7x - 4 = 87
7x = 87 + 4
7x = 91
x = 91 : 7
x = 13 ------------------- odpowiedź
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wiek MARKA ----x
WIEK OJCA ---3x
wiek mamy --- 3x - 4
x + 3x + 3x - 4 = 87
7x - 4 = 87
7x = 87 + 4
7x = 91
x = 91 : 7
x = 13 ------------------- odpowiedź