Question

Anu has grades of 84, 76, and 65 on three Maths tests. What
grade must she obtain on the next test to have an average of
exactly 80 for the four tests?​

Answer 1

Answer:

95

Step-by-step explanation:

total marks obtained till now= 84+76+65=225

total marks to be obtained to get an average of 80 marks=240

marks needed in the last exam =240-225 =95

Answer 2

Answer:

84+76+65+x÷4=80

225+x÷4=80

225+x=80×4

225+x=320

x=320-225

x=95