Ted need to score at least 70 on his three tests, he has scored already 85 and 60 on two test, what would be the third test score?

First test: 85
second test: 60
third test: x = ?
total: 70

(85 + 60 + x) / 3 >= 70
You have to divide this by the number of tests Ted will take (in this case 3).
145 + x >= 70 * 3
x >= 70 * 3 - 145
x >= 210 - 145
x >= 65

Ted has to score at least 65 on his third test.

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