Question

57 + ( 20 : 5 + 2 ) ] : ( 3 × 2 + 1 )} × 2

Answer 1

{[57+(20:5+2)]:(3x2+1)}x2
{[57+(4+2)]:(6+1)}x2
{[57+6]:7}x2
{63:7}x2
9x2
18