search
Log In
Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true
1 vote
74 views

In a class consisting of $100$ students, $20$ know English and $20$ do not know Hindi and $10$ know neither English nor Hindi. The number of students knowing both Hindi and English is:

  1. $5$
  2. $10$
  3. $15$
  4. $20$
in Quantitative Aptitude 9.1k points 21 371 778
edited by
74 views

1 Answer

0 votes
$\textrm{According to the question $E+H=100$,}$

$\textrm{where E=number of students who can speak English, H=number of a student who can speak Hindi.}$

$\textrm{there are 10 students who don’t speak any one of the languages.}$

$\therefore$ $H+E=90$

$n(E)=20,n(H)=80,n(H\cup E=90)$

$\because$ $n(H\cup E)=n(E)+n(H)-n(H\cap E)$

$\implies$ $90=20+80-n(H\cap E)$

$\implies$ $n(H\cap E)=10$

$\textrm{The number of students knowing both Hindi and English is 10}$
3.2k points 4 10 59

Related questions

0 votes
0 answers
1
55 views
A dinner party is to be fixed for a group consisting of $100$ persons. In this party, $50$ persons do not prefer fish, $60$ prefer chicken and $10$ do not prefer either chicken or fish. The number of persons who prefer both fish and chicken is: $10$ $20$ $30$ $40$
asked Apr 3, 2020 in Quantitative Aptitude Lakshman Patel RJIT 9.1k points 21 371 778 55 views
1 vote
0 answers
2
64 views
In a triangle $XYZ$, $P$ and $Q$ are points on ${XY,XZ}$ respectively such that $XP=2PY$, $XQ=2QZ$, then the ratio, of area of $\triangle XPQ$ and area of $\triangle XYZ$ is: $4:9$ $2:3$ $3:2$ $9:4$
asked Apr 1, 2020 in Quantitative Aptitude Lakshman Patel RJIT 9.1k points 21 371 778 64 views
0 votes
1 answer
3
84 views
______people readily adjust their behavior in response to external circumstances. Self-monitoring Depressed Unintelligent Elderly
asked Apr 1, 2020 in Attitude and Leadership Lakshman Patel RJIT 9.1k points 21 371 778 84 views
0 votes
1 answer
4
134 views
Read the passage carefully and choose the best answer to each out of the four alternatives. Some years ago I had the privilege of meeting the world's oldest man. At least he said he was. And he was so dogmatic about it that the promoters of a cartoon strip that ... sixth wife He didn't like traveling much He didn't like New York as a city He preferred to be left alone in his native village
asked Apr 1, 2020 in English Language Lakshman Patel RJIT 9.1k points 21 371 778 134 views
1 vote
1 answer
5
103 views
Which of the following letters will be sixth to the right of the eighteenth letter from the left after reversing the second half of the following English alphabets? $\text{A B C D E F G H I J K L M N O P Q R S T U V W X Y Z}$ $X$ $P$ $O$ $N$
asked Apr 1, 2020 in Logical Reasoning Lakshman Patel RJIT 9.1k points 21 371 778 103 views
...