Answer:
5 deluxe violins and 15 standard violins
Explanation:
5 x 800 = 4,000
(That was for deluxe violins' price all together ^)
and...
15 x 500 = 7,500
(That was for standard violins' price all together)
4,000 + 7,500 = 11,500
∴ 5 deluxe violins and 15standard violins to fit the question rules!
Hope this helps :]