The difference of two numbers is 11 and one fifth of their sum is 9. The numbers are :	Select.
A) 31, 20
B) 30, 19
C) 29, 18
D) 28, 17
E) none
x − y = 11, x + y = 5 × 9 x − y = 11, x + y = 45, y = 17, x = 28   Answer: 28, 17
<result>D</result>
The difference of two numbers is 11 and one fifth of their sum is 9. The numbers are :