The sum of two numbers is 40 and their difference is 20. Find their product. Pick one:
A) 300  B) 108  C) 114  D) 325  E) None
Sol.   Let the numbers be x and y.   Then, x + y = 40 and   x - y = 20.   2x = 60 =&gt; x = 30 So y = 10   xy = 30 * 10= 
<gadget id="calculator">30 * 10</gadget>
<output>300</output>
300   300nswer : 300
<result>A</result>
The sum of two numbers is 40 and their difference is 20. Find their product.