Question

When 636 is subtracted from a number, the number is reducted to its
two-fifth. Which of the following is twice that number?​

Answer 1

$Let \: a \: number \: be \: \blue{x}$

/* According to the problem given */

$x - 636 = \frac{2}{5}x - x$

/* Multiplying each term by 5, we get */

$\implies 5x - 3180 = 2x - 5x$

$\implies 5x -3180 = -3x$

$\implies 5x + 3x = 3180$

$\implies 8x = 3180$

$\implies \frac{8x}{4} = \frac{3180}{4}$

$\implies 2x = 795$

Therefore.,

$\red{ Twice \: the \: number \: (2x)} \green { =795 }$

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