Question

Every time mr. frank buys 4 pots of flowers for the float, the flower shop will give him 1 pot free. after 4 weeks, he had 50 pots of flowers. how many pots did he get for free?

Answer 1

He got 10 pots for free

Answer 2

Let the number of the pots be n.
He buys 4n,so he will have 4n+1 pots
so 4n+n=50
=> 5n=50
=> n=10 pots of flowers for free

Verification:
4*10+10=50