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y = umur ayah
x+x+y= 54 karena kembar umur sama maka x+x+y
x+y=42
x+42=54
x=12
y=42-12 = 30
semoga membantu dan dapat dimengerti
umur 2 anak = 12 x 2 = 24
umur ayah = 54 - 24 = 30