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180 = 9x + 4x + 5x
180 = 18x
10 = x
p = 9x
= 90
q = 5x
= 50
r = 4x
= 40
b. p
c .r
d.<p terbesar maka lawannya qr yang besar
e.<r terkecil maka lawannya pq terkecil