The difference between one-fourth of a number and one-seventh of the same number is $24$. What is the number?

Two baskets together have $640$ oranges. If $\frac{1}{5}$ of the oranges in the first basket are taken to the second basket,the number of oranges in both baskets becomes equal. The number of oranges in the first basket is:

The sum of three consecutive odd numbers is $20$ more than the first of these numbers. What is the middle number?

The units digit in $3 \times 38 \times 537 \times 1256$ is

How many positive factors of $36$ are there?

The least number which when divided by $6, 9, 12, 15, 18$ leaves the same remainder $2$ in each case is