Multiple choice questions

If $\frac{3}{5}$ of a number is $15$, the number is

Ajay's age after $7$ years will be $18$. His age $5$ years ago was ______.

 The cost of a dozen of pencils is $₹72$. So, the cost of $2$ pencils is _____.

If $15x=68-19x$, then $x=$ _____.

If $5$ more than $3$ times a number is $17$, then the number is  _____.

If $42=7(5+x)$, then $x$ is  _____.

The sum of two consecutive numbers is $27$. Their product will be  _____.

The length of a rectangle is $2$ times its width and the perimeter of the rectangle is $60 \mathrm{cm}$. The area of the rectangle is _____.