At present the age of the father is five times that of the age of the son. Three years hence the father's age would be 4 times that of his son. Find the present age of the father?
Choose one: A) 9years B) 25years C) 45years D) 30years E) 50years
Age of the son = (4-1)*3 / (5-4)= 
<gadget id="calculator">(4-1)*3 / (5-4)</gadget>
<output>9</output>
9 years   Age of the father= 9*5= 
<gadget id="calculator">9*5</gadget>
<output>45</output>
45 years   Answer is 45years
<result>C</result>
At present the age of the father is five times that of the age of the son. Three years hence the father's age would be 4 times that of his son. Find the present age of the father?