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U2 = 2y
153 = U1 + U2
153 = y + 2y
153 = 3y
153 : 3 = y
51 = y
maka
U1 = y = 51
U2 = 2y = 2 x 51 = 102
jawaban = A
Bilangan 2 = 2x
maka, x+2x=153
3x=153
x=51
jawabannya A