If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is:	Choose the correct choice from the following options:
A) 12
B) 28
C) 160
D) 180
E) 18
Let the numbers be x and y.   Then, x + y = 20 and x - y = 8   x2 - y2 = (x + y)(x - y) = 20 * 8= 
<gadget id="calculator">20 * 8</gadget>
<output>160</output>
160.   ANSWER:160
<result>C</result>
If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: