Ahh I remember doing this but I don't remember clearly. Lemme look for my old notes
The expression would be written as:

n-3
N is any number. This expression means two-fifths of a number, subtract three. Now substitute 25 for n.

(25)-3
=10-3
=7
Answer:
They have 69 cookies left.
Step-by-step explanation:
7 x 14 = 98
98 - 29 = 69