Jammu and Kashmir Board Solutions for Chapter: Playing With Numbers, Exercise 11: Exercise

If $21y5$ is a multiple of $9$, where $y$ is a digit. What is the value of $y$?

If $31\mathrm{z}5$ is a multiple of $9$, where $\mathrm{z}$ is a digit, what is the sum of all possible values of $\mathrm{z}$?

$24x$ is a multiple of $3$, where $x$ is a digit, what is the value of $x$?

If $31\mathrm{z}5$ is a multiple of $3$, where $\mathrm{z}$ is a digit, what might be the values of $z$?