linear equations Questions

The age of a son today is ${\frac{1}{4}}^{\text{th}}$ of the age of his father. After $20$ years, the age of the father will be twice the age of his son. The age of the father today is:

A farmer has some hens and some rabbits. If the total number of the feet of the hens and the rabbits is $160$ and their total number of heads is $50$, the number of hens the farmer has is:

In a two digit number, the unit's digit exceeds ten's digit by $2$ and the product of the sum of the digits and the number itself is $144$, then what is the number?