Suppose your average, after taking 3 quizzes, is 76 (out of 100). what must your average be on the next 5 quizzes to increase your average to 81 out of 100
3 exam(did) + 5 exam(will do) = 8 8 * 81 = 648 total score (from 800) you did 3 exam by the average of 76 so you have th 3 * 76 = 228 point out of 684. so you need 648 - 228 = 420 point in total in 5 exam so the average in the next 5 exam should be 420 / 5 = 84. you should get 84 out of 100 in the next 5 quizzes.
