Question

11 more than five a certain number is twenty more than 2 times of that number

Answer 1

"11 more than five of a certain number would be written as 5x+11 and it is (means equal to) twenty more than two times that number, which would be 2x+20. So the equation would be 
5x+11=2x+20
-2x -2x (get the x's on one side) 
3x+11=20 
-11 -11 (get the numbers on one side) 
3x=9 
/3 /3 (divide by 3, so you can get the x by itself) 
X=3 (the number is 3)"

Answer 2

5x +11=2x+20
5x -2x +11=20
3x+11=20
3x=20-11
3x=9
x=9/3
x=3