Question

50+{30-2×[20-45÷(13-2×5)-1]}

Answer 1

50+{30-2×[20-45÷(13-10)-1]}
50+{30-2×[20-45÷3-1]}
50+{30+2×[20-15-1]}
50+{30+2×[05-1]}
50+{30+2×4}
50+{30+8}
50+38
88