In an electric circuit, two resistors with resistances x and y are connected in parallel. If R is the combined resistance of these two resistors, then the reciprocal of R is equal to the sum of the reciprocals of x and y. What is R if x is 4 Ohms and y is 6 Ohms?	Answers:
A) 5/12
B) 7/12
C) 12/5
D) 7/5
E) 11/5
1/R = 1/x + 1/y   1/R = 1/4+1/6 = 5/12   R = 12/5   The answer is 12/5.
<result>C</result>
In an electric circuit, two resistors with resistances x and y are connected in parallel. If R is the combined resistance of these two resistors, then the reciprocal of R is equal to the sum of the reciprocals of x and y. What is R if x is 4 Ohms and y is 6 Ohms?