[tex]\frac{20}{2(5+5)}[/tex] - Following the order of operations, we do parenthesis first.
[tex]\frac{20}{2(10)}[/tex] - Multiply out the value against the parenthesis.
[tex]\frac{20}{20} = 1[/tex] - This leaves us with 20 over 20. 20 goes into 20 only 1 time, so our final answer is 1.
