Ages related by ratios at two different times: form two equations

This type of question, asked 3 times: CDS 2 2017, CDS 1 2019, CDS 2 2021. All 3 questions below, oldest first.

Try each one first, then open its answer.

Question 1
CDS 2 2017
29 $Five years ago, Ram was three times as old as Shyam. Four years from now, Ram will be only twice as old as Shyam. What is the present age of Ram ?$
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Question 2
CDS 1 2019
73 $Radha and Rani are sisters. Five years back, the age of Radha was three times that of Rani, but one year back the age of Radha was two times that of Rani. What is the age difference between them ?$
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Question 3
CDS 2 2021
34 $The present age of a father is equal to sum of the ages of his 4 children. After ten years the sum of the ages of the children will be 1.6 times the age of their father. What is the present age of father ?$
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Question 1