Answer:
Q - P
Explanation:
I think that is what it is, it is my blank answer but i think it is that because he pays the cashier $Q and the book is $P, we know Daniel the big fat nerd wants to buy the book so he has enough (obviously)
$(q-3p)
1 book cost: $p
3 books cost:$p×3=$3p
Amount paid: $q
amount of change he will receive=$(q-3p)
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