Answer:
73
Explanation:
Call the unknown test score x.
Add up the test scores.
70+60+77+x
divide by 4, and we want that to equal 70.
So the equation is:
(70+60+77+x)/4 = 70
Solve for x
70+60+77+x = 280
x= 280-70-60-77
x = 73
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