If a two-cycle engine on a weed trimmer uses a 24:1 fuel ratio, you should mix:

In a 24:1 fuel ratio, the "24" refers to the parts of gasoline, while the "1" refers to the parts of oil. This means that for every 24 parts of gasoline, you need to add 1 part of oil.

Mixing fuel at the specified ratio is crucial for the proper functioning of a two-cycle engine. This ensures that there is enough oil to adequately lubricate the engine components, which is particularly important since two-cycle engines do not have a separate oil reservoir; the fuel and oil are mixed together.

Therefore, the correct approach to achieve a 24:1 ratio is to combine 24 parts of gasoline with 1 part of oil, ensuring the engine has the appropriate lubrication while running efficiently. The other options do not match this requirement, as they either suggest incorrect proportions or incorporate unrelated substances.