The ratio of the sum of the reciprocals of x and y to the product of the reciprocals of x and y is 1:3. What is sum of the numbers x and y?
A
1/3
B
1/2
C
1
D
2
Correct Answer: 1/3
1x + 1y:1x×1y = 1:3 ⇒ 1x + 1y1xy = 13 ⇒ x + yxy×xy = 13 ⸫ x + y = 13