Question

60-70

50+40

10+30

20+40

30-20

10+40

Answer 1

60-70=-10
50+40=90
10+30=40
20+40=60
30-20=10
10+40=50

Answer 2

60 - 70 = -10

50 + 40 = 90

10 + 30 = 40

20 + 40 = 60

30 - 20 = 10

10 + 40 = 50

Answer 3

60-70=-10
50+40=90
10+30=40
20+40=60
30-20=10
10+40=50

Answer 4

60 - 70 = -10

50 + 40 = 90

10 + 30 = 40

20 + 40 = 60

30 - 20 = 10

10 + 40 = 50