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

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kit2tShannaGuadrial kit2tShannaGuadrial

25-03-2017
Mathematics

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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

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labab37 labab37 · Answer 1 · 2017-03-25T17:51:26+01:00

labab37 labab37

25-03-2017

(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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