Question

50-3×{7+8:4-[20-3×(9-5)]}

Answer 1

50-3×{7+8:4-[20-3×(9-5)]}
=50-3x[7+2-(20-3x4)]
=50-3x[9-(20-12)]
=50-3x[9-(8)]
=50-3x(9-8)
=50-3x1
=50-3
=47