Troy has four 20 books. He give his friend two 10 books. How many books does Troy have now?

Answer 1

Imma try my best to answer this:
So Troy has 4 20 books which are technically saying 4x20=80.
Troy gave his friend two 10 books, which is saying 2*10= 20.
80-20=60.

So Troy has 60 books left.