Question

Quanto é 12+{4+[9+(6+1)]}

Answer 1

12 + {4 + [9 + (6 + 1)]} = 
12 + {4 + [9 + 7]} =
12 + {4 + 16} =
12 + 20 =
32

Answer 2

12+{4+[9+(7)]}
12+{4+16}
12+{20}
12+20=36