Linear Equation...

Twenty years ago, my age was $$\left (\displaystyle \frac{1}{3}\right)$$rd  of what it is now. What is my present age?

The number of variables in a simple linear equation is

In $$\displaystyle \frac {a}{8}\, +\, \displaystyle \frac {a}{4}\, =\, 6$$, the value of $$a$$ is:

The length of a rectangle is $$12$$ m and its area is $$72 m^2$$. Then the breadth equals to

A person was asked to state his age in years. His reply was, take my age three years hence multiply it by $$3$$ and then subtract three times my age three years ago and you will know how old I am. What was the age of the person?

A farmer divided his herd of x cows among  his 4 sons so that one son gets one half of the herd, the second gets one-fourth, the third son gets one-fifth and the fourth gets 7 crows . Then x is 

If the sum of $$\displaystyle\frac{1}{3}$$ and $$\displaystyle\frac{1}{4}$$ is x times the difference of $$\displaystyle\frac{1}{3}$$ and $$\displaystyle\frac{1}{4}$$, then the value of x is equal to

Anita had to do a multiplication. Instead of taking 35 as one of the multipliers she took 53. As a result the product went up by 540. What is the new product?

A man has 480 rupees in the denominations of one-rupee, five rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has?

The sum of a number and its half is $$84$$. Number will be-