We have to write an expression for the statement "1/5 of the difference between 18 and 11".
To do that we can break the given statement into smaller pieces like "1/5 of " and "the difference between 18 and 11"
difference means use subtraction so
the expression for the substatement "the difference between 18 and 11" will be (18-11)
Now we can club this with left out statement "1/5 of ".
word "of" indicates product.
So expression for the statement "1/5 of the difference between 18 and 11", will be

Hence final answer is
.