Answer:
The
of the cookies are peanut butter.
Explanation:
It is given that in a cookie jar,
of the cookies are chocolate chip and
of the rest are peanut butter.
Since
of the cookies are chocolate chip, therefore the reaming part is

Since
of the rest are peanut butter, therefore the part cookies that is peanut butter is calculated as,

Therefore the required expression is
or
. So,
of the cookies are peanut butter.