So for this we need to convert the word problem into an equation, and it'll look like this: 
(n=number). And from there, we can solve.
Multiply 2 and (n+11) and your equation should look like
Add 22 on each side, and your equation should look like
Subtract 2n on each side, and your answer should should be
Multiply 2 and (n+11) and your equation should look like
Add 22 on each side, and your equation should look like
Subtract 2n on each side, and your answer should should be