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2 : 3 : 7
2y : 3y : 7y
180 = 2y + 3y + 7y
180 = 12y
180 : 12 = y
15 = y
<A = 2y = 2 x 15 = 30
<B = 3y = 3 x 15 = 45
<C = 7y = 7 x 15 = 105
maka besar dr yg terkecil = <A, <B, <C
180 = 12x
x =180/12
x =15
2x = 2.15
= 30