Question 914259
let a,b,c represent the first three exams ishaan took 
 so,   a+b+c/3=85
      
      a+b+c=255...
let d represent the next exam ishaan will take,so that
     
      255+d/4 =88
      
   255+d=88(4)
   255+d=352
   d=352-255=97
Ishaan needs a score of 97 in his next exam to get an average of 88 after taking four exams.