Question 345084
Start by making the translation from English to math.

"The sum" means to add.
"Four times a number" means 4 times an unknown number, which we usually call 'x'.  So, it is 4x.
That is the first element of the "sum."
"and 3" means +3.
"is eleven" means = 11.

So, we have the parts of the addition now:
{{{4x + 3 = 11}}}
.
Done.