Question

180÷{10+2×[20-45÷(13-2×5)]}

Answer 1

180÷{10+2×[20-45÷(13-2×5)]}
=180÷{10+2x[20-45÷(13-10)]}
=180÷[10+2x(20-45÷3)]
=180÷[10+2x(20-15)]
=180÷(10+2x5)
=180÷(10+10)
=180÷20
=9