The sum of two numbers is 25 and their difference is 15. Find their product.  Select:
A) 104	B) 100	C) 114	D) 325	E) None
Sol.   Let the numbers be x and y.   Then, x + y = 25   x - y = 15   2x = 40 =&gt; x = 20   so, y = 5   xy = 20* 5= 
<gadget id="calculator">20* 5</gadget>
<output>100</output>
100   Answer 100
<result>B</result>
The sum of two numbers is 25 and their difference is 15. Find their product.