A father said to his son, "I was as old as you are at present at the time of your birth." If the father's age is 50 years now, the son's age 10 years back was?  Choose the correct choice from the following:  A) 12yr  B) 15yr  C) 14yr  D) 10yr  E) 20yr
Let the son's present age be x years   Then, 50-x = x   x = 25   Son's age 10 years back = 25-10= 
<gadget id="calculator">25-10</gadget>
<output>15</output>
15years   Answer is 15yr
<result>B</result>
A father said to his son, "I was as old as you are at present at the time of your birth." If the father's age is 50 years now, the son's age 10 years back was?