Question

3) 60 – {40 + [(8 – 2) + (5 – 3)]}
4) 100 – 38 – {60 – [40 – (22 – 13)]}

Answer 1

3) 60-{40+[(8-2)+(5-3)]}
60-{40+[6+2]}
60-{40+8}
60-48
12

4)100-38-{60-[40-(22-13)]}
100-38-{60-[40-9]}
100-38-{60-31}
100-38-29
62-29
33