1 because 14000=1 can which is greater than 6200. He can’t buy parts of a can so he will have to use the whole can with some left to spare.
I assume you mean divide using the conjugate to rationalize the denominator and express the result in standard rectangular form.

Well 6×12=72. I don't know what the original tank size was but subtract the original from this one to get your answer.
Answer:
213.75
Step-by-step explanation:
95×9=855
855÷4=213.75