Correct: 20+30=50, 80-50=30, 70+30=100, 90-30=60, 40-40=0, 60-50=10, 40+40=80, 100-40=60, 30-20=10, 90-10=80, 60-30=30, 20-20=0, 100-20=80, 60+40=100, 40-30=10, 80-30=50, Incorrect: 70-20=10, 50+50=90, 80-70=20, 40-40=40, 30+20=60, 50+10=40, 60-10=70, 100-10=30, 70+10=60,

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