The sum of two numbers is 18. Their difference is 4. What are the numbers?
Choose the correct choice from the following answers: A) 8,6 B) 9,9 C) 11,7 D) 15,3 E) 13,9
Let two numbers be x and y.   Equation (i): x + y = 18   Equation (ii): x - y = 4   Solve system of equations:   2x=22   x=11   y=7   Answer 11,7 is correct.
<result>C</result>
The sum of two numbers is 18. Their difference is 4. What are the numbers?