Hey there!!
Let's take the number as ' n '
Three times the difference of a four and number.
... 3 ( 4 - n )
Eight more than the expression.
... 8 + 3 ( 4 - n )
' n ' is given as ' 3 '.
Plugging in :
... 8 + 3 ( 4 - 3 )
... 8 + 3 ( 1 )
... 8 + 3
... 11
The required answer is 11.
Hope my answer helps!!