The sum of two numbers is 20 and their difference is 10. Find their product.	Options.
A) 104  B) 114  C) 75  D) 325  E) 335
Let the numbers be x and y.   Then x + y = 20 and x - y = 10   x = 15; y = 5   xy = 15 * 5= 
<gadget id="calculator">15 * 5</gadget>
<output>75</output>
75   ANSWER: 75
<result>C</result>
The sum of two numbers is 20 and their difference is 10. Find their product.