Question 2431
 
   Let us say the racquets sold at lower rate  =  x
   Let us say the racquets sold at higher rate =  y

   Now, we will frame equations.  The total racquets sold = 200 
   So x + y  =  200  ......    (1)
   In all the total amount received  = $4800
   So 18x + 33y = 4800  ......  (2)
(1)*18, we get
    18x + 18y  =  3600  ......  (3)
 (2)-(3), we get
    15y  =  1200
So    Y  =  {{{1200/15}}} = 80
Substituting the value of y in the eq.(1), we get
     x  + 80 = 200   i.e x = 200-80  =  120

So the no. of racquets sold at $18  =  120
   the no. of racquets sold at $33  =   80       Answer.

gsm