Answer Posted / juliajoyce jeniferkavitha

At his last innings, (15x+23)/(x+1)=16=>x=7;
At his next innings, i.e at the 8th innings,
(15x+23+y)/(x+2)=18; substituting x=7,we get y=34;
Therefore he has to score 34 runs to get an average of 18.

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1360

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1190

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1251

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1218

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1268

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1185

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1162

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1863

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1529

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1837

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1305

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