SOLUTION: The mean of 3 test scores is 74. What mush the score on the 4th test be to raise the mean to a 78?

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Question 1079415: The mean of 3 test scores is 74. What mush the score on the 4th test be to raise the mean to a 78?
Answer by Alan3354(69443) About Me  (Show Source):
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The mean of 3 test scores is 74. What mush the score on the 4th test be to raise the mean to a 78?
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Hint:
3*74 = 222
4*78 = 312