Question

67+{50×[70÷(27+8)+18)÷2]+21}

Answer 1

67+{50x[70:(27+8)+18:2]+21}=
67+{50x[70:35+9]+21}=
67+{50x[2+9]+21}=
67+{50x11+21}=
67+{550+21}=
67+571=
638