After 4 years the age of father is twice as old as his son . 5 years before the father age was 1 year more than triple age of his son.

Step-by-step explanation:

After 4 years the age of father is twice as old as his son . 5 years before the father age was 1 year more than triple age of his son.

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}