When 29 buckets of water were taken from a barrel of water, and then 26 buckets were refilled, then there were 36 buckets

When 29 buckets of water were taken from a barrel of water, and then 26 buckets were refilled, then there were 36 buckets of water in it. How many buckets of water were in the barrel at first?

Let x be the initial number of buckets of water in the barrel.
Let’s make the equation:
(x – 29) + 26 = 36;
To find the unknown term, you need to subtract the known term from the sum.
x – 29 = 36 -26;
x – 29 = 10;
To find what is being diminished, it is necessary to add the difference to the subtracted.
x = 29 + 10;
x = 39.
Answer: At first, there were 39 buckets of water in the barrel.