The $LCM$ of two prime numbers $x$ and $y$ $(x > y)$ is $161$. The value of $3y - x$ is

The fraction $\frac{1095}{1168}$ when expressed in its simplest form is:

Find the least number which when divided separately by $15, 20, 36$ and $48$ leaves $3$ as remainder in each case.

In a school,$442$ boys and $374$ girls have been divided into the largest possible equal classes,so that each class of boys numbers the same as each class of girls. What is the number of classes?

Two pipes of length $1.5\, m$ and $1.2\, m$ are to be cut into equal pieces without leaving any extra length of pipes. The greatest length of the pipe pieces of same size which can be cut from these two lengths will be (in $metre$)

The greatest $4-$digit number exactly divisible by $10, 15$ and $20$ is