The average of 35 raw scores is 18.the average of first seventeenth of them is 14 and that of last seventeenth is 20.find the eighteenth raw score.

let 35 raw scores be x1,x2,x3,......,x34,x35 average of 35 raw scores is 18 then [ (x1)+(x2)+(x3)+..….....+(x34)+(x35) ] / 35=18 [ (x1)+(x2)+(x3)+..….....+(x34)+(x35) ]=35(18)=6...