There is a ratio of 10 : 13 between two numbers. If 80 percent of the first is 16, then 50% of the second number is

17 13 25 14

13

A  :  B 10 : 13 According to the question, ⇒ 10x × 60% = 16 ⇒ x = 2, ⇒ A = 10(2) = 20, ⇒ B = 13(2) = 26 ⇒ 50% of B = 50% of 26 = 13.