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Question

Georgia has scored 83 and 94 on her first two history tests. What score does she need on her third test so that her average score will be exactly 90?

Answer

The score for the third test is 93. Step-by-step explanation: Let's start with the given information that the average score for three tests is 90. We can use the formula for average, which is: average = (sum of all scores) / (number of scores) We know that the sum of the scores for the three tests is 270 (since 90 x 3 = 270). So, we can write: 90 = (83 + 94 + t) / 3 Multiplying both sides by 3: 270 = 83 + 94 + t Combining like terms: 270 = 177 + t Subtracting 177 from both sides: 93 = t Therefore, the score for the third test is 93.