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20 February, 17:05

When Sally went bowling, her scores were 108,72and 95. If she bowls a 4th game, what will her score need to be to give her an average of 91?

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  1. 20 February, 19:52
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    (108+72+95+x) / 4=91

    (347+x) / 4=91

    347+x=91•4

    347+x-347 = 364-347

    X=17

    She must score a 17 to get a mean of 91
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