When denominators are the same, add the numerators and keep the denominator. Then simplify.

The fractions already have the same denominator (20). Add the numerators.
Sum	=	\(\dfrac{11}{20} + \dfrac{11}{20} = \dfrac{22}{20}\)
Simplify: divide numerator and denominator by their GCD. GCD(22, 20) = 2.
Simplified	=	\(\dfrac{22 \div 2}{20 \div 2} = \dfrac{11}{10}\)
Convert to a mixed number: 11/10 = 1 whole and 1/10.
As mixed number	=	\(1\dfrac{1}{10}\)