Problema Solution
Suppose your average, after taking 3 quizzes, is 71 (out of 100). What must your average be on the next 6 quizzes to increase your average to 89 out of 100?
Required average
Answer provided by our tutors
let
A = the sum of the points scored on the first 3 quizzes
B = the sum of the points scored of the next 6 quizzes
A/3 = 71
(A + B)/9 = 89
by solving the above system we find
B = 588
click here to see the step by step solution of the system of equations
the average of the next 6 quizzes is B/6 that is 588/6 = 98.