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Verified answer
15 = 3 x 520 = 2² x 5
30 = 2 x 3 x 5
KPK = 2² x 3 x 5 = 60.
FPB = 5.
20=2x2x5
30=2x3x5
KPK=2x2x3x5
=60
FPB=5