Question 769497
Suppose we assume the two numbers are x and y, with x being the smaller one. The sum of the 2 numbers is {{{x+y=38}}}, and we are also given that {{{3x-y=30}}}.
Adding the two equations, we get {{{x+y+3x-y=30+38}}}, which simplifies to {{{4x=68}}}. Dividing both sides by 4, we get {{{x=17}}}. 
{{{y=38-x=38-17=21}}}

So x=17 and y=21.