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Fe ⇒ 2p = r
O ⇒ 3p + q = 2s
C ⇒ q = s
misalkan p = 1
2p = r
2(1) = r ⇒ r = 2
q = s
3p + q = 2s
3(1) + s = 2s
2s - s = 3
s = 3
q = s ⇒ q = 3
jawaban: E. p = 1 ; q = 3 ; r = 2 ; s = 3