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Question

x2 + 20 = 9x

y2 + 42 = 13y



A

a)

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B

b)

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C

d)

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D

e)

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Solution

The correct option is C

b)


x2 - 9x + 20 = 0

x 2 - 5x - 4x + 20 = 0

x(x - 5) - 4 (x - 5) = 0

(x - 4) (x - 5) = 0

x = 4 or 5

y2 - 13 y + 42 = 0

 =>y2 - 7y - 6y + 42 = 0

=>y(y - 7) - 6(y - 7) = 0

=>(y - 6) (y - 7) = 0

=> y = 6 or 7

So, we see that x<y


Quantitative Aptitude

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