If twice the son's age be added to the father's age,the sum is $70 \text{ years}$ and if twice the father's age is added to the son's age,the sum is $95 \text{ years}$. Then the father's age is (in $\text{years}$):

Eighteen $years$ ago,a father was three times as old as his son. Now the father is only twice as old as his son. Then the sum of the present ages of the son and the father is

$Q$ is as much younger than $R$ as he is older than $T.$ If the sum of the ages of $R$ and $T$ is $60 \text{ years},$ what is definitely the difference between $R$ and $Q$'s age? (in $\text{years}$)

The ratio of the present ages of Swati and Trupti is $4:5.$ $6 \text{ years}$ hence the ratio of their ages will be $6:7.$ What is the difference between their ages? (in $\text{years}$)

The ratio between the ages of Arun and Deepak at present is $4:3$. After $6$ years,Arun's age will be $26$ years. What is the age of Deepak at present? (in years)

$A$ 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? (in years)