Mr. Sohanlal is four times as old as his son. Four years later, the sum of their ages will be 43 years. The present age of the son is:

Explanation Option [b] is correct. Let the present age of the son be x years. Then, the age of Sohanlal would be 4x years. Four years later, their ages would be (x + 4) and (4x + 4) years, respectively. Now, as per the information given in the question, (x+4)+(4x+4)=43. or      5x+8=43 or      5x=35 years or       x=7  years Therefore, the present age of the son is 7 years. Number of even numbers from 2 to 50 are 25. Number of odd numbers from 2 to 50 are 24. Number of prime numbers from 2 to 50 are 15.