Question

How to write equation for that problem

Answer 1

$let \: \: the \: \: number \: \: be \: \: x \\ the \: student \: is \: asked \: to \: get \\ \frac{ (\frac{x}{2}) }{6} + \frac{ (\frac{x}{2}) }{4} = \frac{x}{12} + \frac{x}{8}$
$but \: \: he \: \: did \: \frac{x}{5 } \: \: which \: is \: of \: 4 \: short \\ of \: correct \: answer \\ so \: equation \: becomes \\ \frac{x}{5} = ( \frac{x}{12} + \frac{x}{8} ) - 4$
Solving this, x = 480