The average age of $x$ and $y$ is $20$ $years.$ If $z$ were to replace $x,$ the average would be $19$ and if $z$ were to replace $y$, the average would be $21.$ Find the ages of $x, y$ and $z$.
$22,18,20$
$18,22,20$
$22,18,20$
$18,20,22$
A batsman score $98$ runs in the $17^{\text {th }}$ match of his career. His average runs per match increase by $2.5$ What is his average before the $17^{\text {th }}$ match?
The average of three numbers is $154 .$ The first number is twice the second and the second number is twice the third. The first number is
The average of a batsman after $25$ innings was $56$ runs per innings. If after the $26^{\text {th }}$ inning his average increased by $2$ runs, then find his score in the $26^{\text {th }}$ inning?
The average of $5$ consecutive $integers$ starting with $'m'$ is $n.$ What is the average of $6$ consecutive $integers$ starting with $(m+2) \,?$
The mean of $19$ observations is $4 .$ If one more observation of $24$ is added to the data, the new mean will be