seriously whats wrong with you theres something called a calculator, but yet you have time to post a question but not type in a simple 5th grade math question!!!
48= 48/1
$$\\\frac{48}{1}\times\frac{5}{12}\\\\
\frac{48\times5}{1\times12}\\\\
=\;\frac{240}{12}\\\\
Simplify\quad(\div\;both\;by\;12)\\\\
=\;\frac{20}{1}\\\\
=\;20$$