90-30:3???????????????

Question

90-30:3???????????????

Answer 1

90-30:3=80
1)30:3=10
2)90-10=80

80-40:2=60
1)40:2=20
2)80-20=60

Comments

80-40:2???????????????

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1) 40:2=20, 2) 80-20=60)

Answer 2

1) 30:3=10
2)90-10=80

Comments

80:4-10??????????????