What is the approximate average number of teachers teaching Economics, History and Biology together?

400

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420

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450

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480

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470

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Solution

The correct option is B 420
Number of teachers teaching Economics, History and Biology
$= \frac{2000 \times 64}{100} = 1280$
$∴$ Required average
$= \frac{1280}{3} = 426.6 = 420$

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