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Averages

The average o...

Question

The average of 15 results is 40 and that of first seven is 30 and that of last seven is 34. The value of 8th result is:

160

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152

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138

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148

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158

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Solution

The correct option is B
152

8 $^{t h}$ number will be = Sum of 15 results - (Sum of first seven + Sum of last seven) = (15 x 40) - (7 x 30 + 7 x 34) = 152.

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