52-(27+21), 80-(16+34),70-(45+23),(60-36)+15,90-(54-39),64-(16+18)

Question

52-(27+21), 80-(16+34),70-(45+23),(60-36)+15,90-(54-39),64-(16+18)

Answer 1

4, 30, 2, 39, 75, 30

Answer 2

1)52-(27+21)=52-48=4
2)80-(16+34)=80-50=30
3)70-(45+23)=70-68=2
4)(60-36)+15=24+15=39
5)90-(54-39)=90-15=75
6)64-(16+18)=64-34=30