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There are b boys and g girls in a class ...

There are b boys and g girls in a class and the average of number of boys and the number of girls is 18. Then b+g=_____

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PEARSON IIT JEE FOUNDATION-FORMULAS-TEST YOUR CONCEPTS (Very Short Answer Type Questions)
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  17. If V=lbh, then b=

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  19. The subject of the formulae ,A=2h(l+b) is

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