700 20+80 500 300-100 =. ? 400 50+50

Question

700 20+80
500 300-100 =. ?
400 50+50

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Answer 1

700+20+80=720+80=800
500+300-100=800-100=700
400+50+50=450+50=500

Answer 2

700+80+20=80+20=100+700=800
500+300-100=300-100=200+500=700
400+50+50=50+50=100+400=500