The average age of a teacher and three students is $20$ years. If all the students are of the same age and the difference between the teacher's age and the age of one of the students is $20$ years,find the teacher's age in years.
- A$25$
- B$30$
- C$35$
- D$45$
Explore More
Similar Questions
The mean of the series $a, a + nd, a + 2nd$ is
Easy
View SolutionThe median of a set of $19$ observations is $30$. If two observations with values $8$ and $32$ are added,what is the median of the new set of $21$ observations?
Medium
View SolutionFind the mean of the following frequency distribution:
$x_i$ $5$ $15$ $25$ $35$ $45$ $55$ $f_i$ $12$ $18$ $27$ $20$ $17$ $6$
| $x_i$ | $5$ | $15$ | $25$ | $35$ | $45$ | $55$ |
| $f_i$ | $12$ | $18$ | $27$ | $20$ | $17$ | $6$ |
Medium
View SolutionThe relation between the median $M$,the second quartile ${Q_2}$,the fifth decile ${D_5}$,and the $50^{th}$ percentile ${P_{50}}$ of a set of observations is:
Find the median of the following frequency distribution.
Class $0 - 10$ $10 - 20$ $20 - 30$ $30 - 40$ $40 - 50$ $f_i$ $8$ $30$ $40$ $12$ $10$
| Class | $0 - 10$ | $10 - 20$ | $20 - 30$ | $30 - 40$ | $40 - 50$ |
| $f_i$ | $8$ | $30$ | $40$ | $12$ | $10$ |
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo