The sum of two numbers is 18 and their difference is 12. Find their product. Select:
A) 104
B) 108
C) 45
D) 325
E) None
Sol.   Let the numbers be x and y.   Then, x + y = 18 and   x - y = 12   2x = 30 +&gt; x = 15. So y = 3   xy = 15*3= 
<gadget id="calculator">15*3</gadget>
<output>45</output>
45   Answer : 45
<result>C</result>
The sum of two numbers is 18 and their difference is 12. Find their product.