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Formation of an Expression

Five times a ...

Question

Five times a number is equal to three times the sum of the number and 4. What is the number?

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Solution

ANS: Let the number be ' $x$ '.
Five times of number $= 5 x$
Three times the sum of the number and $4 = 3 (x + 4)$
According to question
$\begin{matrix} 5 x = 3 (x + 4) 5 x = 3 x + 12 5 x - 3 x = 12 2 x = 12, x = \frac{12}{2} = 6 \end{matrix}$
That is, Number $= 6$

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