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# In a group of 500 people, 200 can speak Hindi alone while only 125 speak English alone. The number of people who can speak both Hindi and English is${\text{A}}{\text{. 175}} \\ {\text{B}}{\text{. 325}} \\ {\text{C}}{\text{. 300}} \\ {\text{D}}{\text{. 375}} \\$

Last updated date: 19th Mar 2023
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Hint: Here, we will proceed by drawing the relevant Venn diagram according to the problem statement and then finding out the value of the unknown regions by visually analysing the diagram.

Given, there are total 500 number of people in the group who can speak either English or Hindi or both Hindi and English (this region is represented by all the three coloured lines which are blue, green and red lines in the figure or the complete region of the figure) i.e., $n\left( {E \cup H} \right) = 500$
Also given that 200 number of people can speak Hindi alone (this region is represented by red coloured lines in the figure) i.e., $n\left( {H{\text{ only}}} \right) = 200$
Also given that 125 number of people can speak English alone (this region is represented by blue coloured lines in the figure) i.e., $n\left( {E{\text{ only}}} \right) = 125$
We have to find the number of people who can speak both Hindi and English (this region is represented by green coloured lines in the figure) i.e., $n\left( {E \cap H} \right)$
$\Rightarrow n\left( {E \cup H} \right) = n\left( {E{\text{ only}}} \right) + n\left( {E \cap H} \right) + n\left( {H{\text{ only}}} \right) \\ \Rightarrow n\left( {E \cap H} \right) = n\left( {E \cup H} \right) - n\left( {E{\text{ only}}} \right) - n\left( {H{\text{ only}}} \right) = 500 - 125 - 200 \\ \Rightarrow n\left( {E \cap H} \right) = 175 \\$
Note: In this particular problem, the total number of people who can speak Hindi (this region is represented by two coloured lines which are red and green) is $n\left( H \right) = 200 + 175 = 375$ and the total number of people who can speak English (this region is represented by two coloured lines which are blue and green) is $n\left( E \right) = 125 + 175 = 300$.