First set up the long division method.
How many times can 3 go into 4? 1. The remainder is 1 so bring that down and bring down the 2.
How many times can 3 go into 12? 4. The remainder is 0 so bring that down and bring down the 7.
Don't forget the decimal point here!
How many times can 3 go into 7? 2. The remainder is 1 so bring that down and bring down the 8,
How many times can 3 go into 18? 6. The remainder is 0. And your problem is finished
Your final answer is 14.26