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hannah scored 149 , 143, 140 and 144 in four bowling games.what score will she need in the fifth game in order to have an average score of 145 for all five games?

Sagot :

Let the 5th score be x

Add the scores, and divide by 5:

149 + 143 + 140 + 144 + x  = 145
                5

576 + x = 145
    5

576 + x = 145 (5)

x = 725 - 576

x = 149

Hannah needs to get a score of 149 on the fifth game in order to have an average of 145.

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