Hi Karuna S.
Keeping in mind that 6/6 = 1 or the whole supply of watermelons for your problem
Let x = whole
Given (5/6)x was sold, so (1/6)x was left per the information given (1/6)x = 8
So x = 6(8) = 48
(5/6)(48) =40 so 40 were sold
40*5.75 = 230
Hope this helps.