Answer:
6 tons to 18 tons as a ratio is 1 : 3.
Explanation:
A ratio tells us how two numbers compare to each other , I.e. how bigger or smaller a number is than another number.
Given that, to compare 6 tons to 18 tons, we just compare the two numbers by writing them as a fraction in the following manner:
which we simply by diving the numerator and the denominator by 6:

which tells us 18 tons is 3 times bigger than 6 tons.