The sum of two numbers is 75 and their difference is 20. Find the difference of their squares.  Choose the correct choice from the following choices
A) 1400
B) 1500
C) 1600
D) 1700
E) 1800
Solution:   If the sum of two numbers is x and their difference is y, then the difference of their squares is xy.   Here x= 75 and y = 20   75 × 20 = 1500   Answer 1500
<result>B</result>
The sum of two numbers is 75 and their difference is 20. Find the difference of their squares.