There is a ratio of 5 : 4 between two numbers. If 40% of the first number is 12, then what would be 50% of the second number ?

Answer: Option A

1^st number : 2^nd number
           5     :     4
40% = $$\frac{2}{5}$$
2 units = 12
5 units = 30
So, 1^st number = 30
2^nd number = $$\frac{30}{5}$$ × 4 = 24
50% of 2^nd = 24 × $$\frac{1}{2}$$ = 12