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Question

52x+72x=562x, find 'a' when 2a3+3x4=1



A

-51/8

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B

43/8

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C

30/7

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D

-26/7

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Solution

The correct option is B

-51/8


52x+72x=562x52x+72x+2x=565x+7x+4x2=5616x=56×2x=56×216=7Now, 2a3=13x42a3=13×742a3=4214=1748a=51a=518


Quantitative Aptitude

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