3 years ago

The average of manny's three tests is an 84. what must he get on a 4th test to raise his average to a 87

1 answer:

3 0

(X+Y+Z)/3=84 X,Y,Z IS THE THREE UNKNOWN SCORES.TO KNOW THE TOTAL , MULTIPLY THE 84 BY 3.
84*3=252
(252+H)/4=87 H IS THE FOURTH GRADE HE SHOULD HE IF HE WANTS HIS AVERAGE TO BE 87
87*4=348
252+H=348
H=348-252
H=96

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