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orang kedua = B
a + b = 27
b = 27 - a
a × b = 180
a × (27 - a)= 180
27a - a^2= 180
a^2 -27a + 180
( a- 12)(a-15)
a = 12
b = 15
selisih
15 - 12 = 3 (b)