Question 1126405

let that something be {{{x}}}

then

{{{10}}} plus something divided by {{{2}}}: {{{10+x/2}}}

 equals {{{25 }}}: {{{10+x/2=25}}}

{{{x/2=25-10}}}

{{{x/2=15}}}

{{{x=15*2}}}

{{{x=30}}}

so, that something is {{{30}}}