A father is 30 years older than his son, however he will be only thrice as old as the son after 5 years, what is the father's present age ?  Answers.
A) 40 yrs
B) 30 yrs
C) 50 yrs
D) 60 yrs
E) None of the above
After 5 years . if ages are F and S , then   F=3S where F = S+30   F= 3*(F-30) = 3F-90   2F = 90   F =45   so present age = 45-5= 
<gadget id="calculator">45-5</gadget>
<output>40</output>
40 years   40 yrsNSWER:40 yrs
<result>A</result>
A father is 30 years older than his son, however he will be only thrice as old as the son after 5 years, what is the father's present age ?