Answer is 3 laptops at $820 each and 12 ipads at $495 each. If u use these noes. to work backwards, you will find that they are correct.
Total amt collected fr LT
= (8400-3480)/2 = $2460
Tot collected fr ipad = $5940

Ipad LT
Ratio of UNITS sold 4 : 1
Total collected 5940 : 2460
For ipad, if 1Unit sold, amt collected would b = 5940/4 = $1485

Hence
Ratio of units 1 : 1
Collections 1485 : 2460
Difference = 975

Price difference of 1 item = $325
I unit = 975/325 = 3
Therefore LT sold = 3.
Ipad sold =12.
Hope u can follow above solution.

Thank you very much for your help

Hi why cant i do: 3480/325 since 3480 is the difference btwn ipad and laptop, and 325 is the difference in price for one

You can only do that PROVIDED the laptops n ipads are the SAME quantity.

Ok thank you