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13 August, 19:15

The average of three test scores if the first two scores are 79 and 93; s = the third test score

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  1. 13 August, 19:43
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    79 + 93 + s = 172 + s then ... 172 : 3 and s : 3 to get 57.3333 etc. + 1/s I think
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