The sum of two numbers is 16, and twice their difference is 4. What are the two numbers? Choose the correct choice
A) 6,7 B) 6,8 C) 5,11 D) 7,9 E) 10,6
Let the two numbers be x and y.   Equation (i): x + y = 16   Equation (ii): 2(x - y) = 4   Solve system of equations:   x=16-y   2(16-y-y)=4   16-2y=2 --- y=7   x+7=16 --- x=9   The two numbers are 7 and 9, so answer 7,9 is correct.
<result>D</result>
The sum of two numbers is 16, and twice their difference is 4. What are the two numbers?