Respuesta :

Shinrinyoku
Answer: 70


Explain:

80*5 = 400
this tells us that the total scores before
dividing must be 400

400 - (78+88+83+81) = 70
this tells us that we lack +70

in conclusion, to get an average of 80% on Sara's test scores; She must receive a grading of 70% in her next test.

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