Question

The sum of two numbers is 10. Their product is twenty. find the sum of reciprocal of the two numbers. ​

Answer 1

Let two numbers be x and y

given x + y = 10 , xy=20

to find $\frac{1}{x} + \frac{1}{y}$

       (x+y) / xy = 10 / 20

                         = 1/2

hence 1/2 is the answer.