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Solution of an Equation

If x+5=10, th...

Question

If $x + 5 = 10$ , then the value of $8 x - 30$ is:

A

5

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B

10

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C

15

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D

40

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Solution

The correct option is B $10$
$x + 5 = 10$
$\Rightarrow x = 10 - 5$
$\Rightarrow x = 5$
Hence, $8 x - 30$
$\Rightarrow 8 (5) - 30 = 40 - 30 = 10$
$The value of 8x - 30 is 10.$

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Solution of an Equation

Standard VII Mathematics

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