Question 162763
These are proportion or ratio problems



{{{2/n=5/10}}} Start with the given ratio



{{{2=(5/10)*n}}} Multiply both sides by n



{{{2*10=5*n}}} Multiply both sides by 10



{{{20=5*n}}} Multiply


{{{20/5=n}}} Divide both sides by 5



{{{4=n}}} Divide



So our answer is  {{{n=4}}}