If the sum of two numbers is 18 and the sum of their squares is 220, then the product of the numbers is	Choices:
A) 40 B) 44 C) 52 D) 88 E) 90
Sol.   Let the numbers be x and y.   Then, (x+y) = 18 and x2 + y2 = 220.   Now, 2xy = (x+y)2 - (x2 + y2)   = (18)2 - 220= 324 - 220= 
<gadget id="calculator">324 - 220</gadget>
<output>104</output>
104   xy= 52.   Answer 52
<result>C</result>
If the sum of two numbers is 18 and the sum of their squares is 220, then the product of the numbers is