There are 5 consecutive odd numbers. If t… | Answer

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Quantitative Aptitude

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There are 5 consecutive odd numbers. If the difference between square of the average of first two odd number and the of the average last two odd numbers is 396, what is the smallest odd number?
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Explanation

Let the five consecutive odd numbers be x-4, x-2, x, x+2, x+4 According to the question, Difference between square of the average of first two odd number and the of the average last two odd numbers is 396 i.e, x+3 and x-3

\begin{array}{l}\Rightarrow\left(\mathrm x\;+\;3\right)^2\;-\;\left(\mathrm x\;-\;3\right)^2\;=\;396\\\Rightarrow\;\mathrm x^2\;+\;9\;+\;6\mathrm x\;-\;\mathrm x^2\;+\;6\mathrm x\;-\;9\;=\;396\\\Rightarrow\;12\mathrm x\;=\;396\\\Rightarrow\;\mathrm x\;=\;33\end{array}

Hence, the smallest odd number is 33 - 4 = 29.

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There are 5 consecutive odd numbers. If the difference between square of the average of first two odd number and the of the average last two odd numbers is 396, what is the smallest odd number?Reading

There are 5 consecutive odd numbers. If the difference between square of the average of first two odd number and the of the average last two odd numbers is 396, what is the smallest odd number?

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There are 5 consecutive odd numbers. If the difference between square of the average of first two odd number and the of the average last two odd numbers is 396, what is the smallest odd number?
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