Mr.Mohit is 7 times as old as his son. 10 years hence he will be three times as old as his son.what is the difference in their present ages?
(A)24years (B)30years (C)18years (D)36years (E)42years

• let present ages of Mohit and his son ages are f and s respectively.
  According to the problem, f=7s and f+10=3(s+10).
  ==> f+10=3(s+10)==> 7s+10=3s+30==>s=5.
  and f=35.
  Therefore the difference in their present ages=35-5=30years.
• 13 years agoHelpfull: Yes(14) No(0)
• x=7y
  x+10=3(y+10)
  gives y=5,x=35
  difference=30 years ans
• 13 years agoHelpfull: Yes(9) No(0)
• 30 yrs
• 13 years agoHelpfull: Yes(1) No(2)
• 35
• 13 years agoHelpfull: Yes(0) No(16)