` 1/5 + 4/11 + 5/5 + 7/11`
` = (1/5 + 5/5) + ( 4/11 + 7/11)`
` = 6/5 + 11/11`
` = 6/5 + 1`
` = 6/5 + 5/5`
`= 11/5`
\(\dfrac{1}{5}+\dfrac{4}{11}+\dfrac{5}{5}+\dfrac{7}{11}=\left(\dfrac{1}{5}+\dfrac{5}{5}\right)+\left(\dfrac{4}{11}+\dfrac{7}{11}\right)=\left(\dfrac{1+5}{5}\right)+\left(\dfrac{4+7}{11}\right)=\dfrac{6}{5}+\dfrac{11}{11}=\dfrac{6}{5}+1=\dfrac{11}{5}.\)