9gr
posted by david .
Caleb scored the following on his first four tests: 78, 84, 88, and 82. What is the least grade he can receive on his next test to have an average of 85 for the five tests?
a.66
b.83
c.93
d.100

5*85=78+84+88+82+N
solve for N 
83

93
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