Question 936434
You can only follow the two formulas to understand the operation symbols, * and #.  
Trust the grouping symbols as you already know them.


Looking at the example formulas with the operators for guidance, first evaluate 4*3; and then evaluate that with #5.  You might also show the entire grouped expression and first find the "simplified" expression  for (4*3)#5,  treating (4*3) as a separate number; and then ....  no...  find out what is  r=4*3  AND THEN find what is r#5.



Reread that and think carefully about it.
Do you see what to do?



Final result should be 5.