Question

average of four numbers is 59.if average of first three numbers is 47 then find fourth number

Answer 1

let a,b,c,d are the numbers

Average of a,b,c,d

i.e,a+b+c+d/4 =59

a+b+c+d=236.....................................1

average of first three numbers

i.e,a+b+c/3=47

a+b+c=141...........................................2

(2)-(1)

d=95