The sum of two numbers is 30 and their difference is 10. Find their product.  Pick one
A) 104 B) 114 C) 315 D) 200 E) 335
Let the numbers be x and y.   Then x + y = 30 and x - y = 10   x = 20; y = 10   xy = 20 * 10= 
<gadget id="calculator">20 * 10</gadget>
<output>200</output>
200   ANSWER:200
<result>D</result>
The sum of two numbers is 30 and their difference is 10. Find their product.