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Logarithms

If log10 x ...

Question

If ${log}_{10} (x - 10) = 1$ , then the value of $x$ is equal to

20

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30

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40

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50

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Solution

The correct option is A $20$
${log}_{10} (x - 10) = 1$
$∴ (x - 10) = 10^{1}$ ...(If ${log}_{a} x = b$ then $x = a^{b}$ )
$∴ x = 20$

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