A person gives 1/4 of his property to his daughter, 1/2 to his sons and 1/5 for charity. How much has he given away ?

Answer: Option B

Let the property is 'P' units
According to the question,
Given part,
$$\begin{array}{rl}& =\frac{1}{4}P+\frac{1}{2}P+\frac{1}{5}P\\ & =\frac{5P+10P+4P}{20}\\ & =\frac{19}{20}P\end{array}$$
Part of property given away $$\frac{19}{20}$$