Question

What is 4.4 and 7.7 tons rounded to the nearest ton

Answer 1

-- 4.4 tons rounded to the nearest ton is  4 tons.

-- 7.7 tons rounded to the nearest ton is  8 tons.

If you meant for something to be done with those two numbers, you'll
have to specify it more clearly.  "And" is not a mathematical operation.

Answer 2

Well, 4.4 + 7.7 = 12.1

So that would be 12 tonnes

Or

4.4 = 4 tonnes

and

7.7 = 8 tonnes

Hope this helps