Question 1083846
A father said to his son, "I was your age when you were born". If the father is currently 42 years old, how old is the son?
<pre>When the son reaches the age that the father was when he (the son) was born, then the father will be twice the son's age, 
or the son is {{{1/2}}} the father's age. Therefore, son is: {{{highlight_green(matrix(1,6, 1/2, of, "42,", or, 21, "years-old"))}}}