Question

john has 10 buckets of water and his friend needed 4 buckets of water and his other friend needed 5 buckets of water how many does he have now

Answer 1

10-4=6
6-5=1
He have 1 bucket
OR
10-(4+5)=1 bucket

Answer 2

Well it depends if he wanted to give his friends what they needed. If not then he remains with 10. If so 10-4=6 6-5=1
10-4-5=1