The sum of two numbers is 90 and their difference is 10. Find their product.
Choose the most appropriate option.
A) 104  B) 2000  C) 315  D) 325  E) 335
Let the numbers be x and y.   Then x + y = 90 and x - y = 10   x = 50; y = 40   xy = 50 * 40= 
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>
2000   ANSWER:2000
<result>B</result>
The sum of two numbers is 90 and their difference is 10. Find their product.