Question 111298
Let x be the first number then x+12 be the larger number.

The sum of the smaller number which is x and twice the larger number which is x+12 is 39. Then we can setup the equation as:
{{{x+2(x+12)=39}}}
Then we solve.
{{{x+2*x+2*12=39}}}
{{{x+2x+24=39}}}
{{{3x+24-24=39-24}}}
{{{3x-0=15}}}
{{{3x=15}}}
{{{x=5}}}
{{{x+12 = 17}}}
The larger number is 17.

Thank you.
~kmcruz09~