The average age of $20$ boys in the class is $15.6\, years.$ Five new boys join and the new average becomes $15.56\, years.$ What is the average age of the five new boys? (in $years$)
$15.5$
$15.4$
$15.25$
$15.3$
The total marks obtained by a student in Physics, Chemistry and Mathematics together is $120$ more than the marks obtained by him in Chemistry. What is the average marks obtained by him in Physics and Mathematics together ?
The average of $6$ numbers is $20 .$ If one number is removed, the average becomes $15 .$ What is the number removed?
If the difference between the average of $x, y$ and $y$, $z$ is $12,$ then the difference between $x$ and $z$ is
The average of $12$ results is $15,$ and the average of the first two is $14.$ What is the average of the rest?
Of three numbers, the second is thrice the first and the third number is three-fourths of the first.If the average of the three numbers is $114,$ the largest number is