9 years ago A's age and B's age were in the ratio of 5:7. Which of the following cannot be the ratio of their ages five years from now:
a) 11/13 b)13:19 c)21.25 d)15:16
Give explanation

• b)13:19 can not be ratio of ages after 5 years from now .
  
  as ratio of ages will approach towards 1 with time and it will never decrease from earlier ratio.
• 12 years agoHelpfull: Yes(3) No(0)
• d)15:16 cannot be the ratio of their ages
• 12 years agoHelpfull: Yes(1) No(2)
• b)13:19 can not be ratio of ages
  
• 10 years agoHelpfull: Yes(0) No(0)