Question

Navin has grades 84, 65 and 76 in three math tests. What grade must he

obtain in the next test to have an average of exactly 80 for the four tests?

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Answer 1

Answer:

Let's write this the way it was meant:

Anna scored 84, 65, and 76 on 3 math tests. What

score must she obtain on the next test to have an

average of 80% on the four tests?

(84+65+76+x)/4 = 80

225 + x = 80(4)

x = 320 -225

x = 95 score on test 4