A cup is a unit of measurement commonly used in cooking and baking in the United States. It is equivalent to 8 fluid ounces or 16 tablespoons. However, the term “thirds” is not a common unit of measurement in cooking, and it is not clear what exactly is meant by this term.

Assuming that “thirds” refers to a fractional amount of a cup, there are a few possibilities. For example, one-third of a cup would be equivalent to approximately 5 and 1/3 tablespoons or 2.7 fluid ounces. Similarly, two-thirds of a cup would be equivalent to approximately 10 and 2/3 tablespoons or 5.3 fluid ounces.
It is important to note that when measuring ingredients for cooking or baking, precision is key. While some recipes may call for measurements in fractional amounts of a cup, it is generally best to measure ingredients using standard measuring cups and spoons to ensure accuracy.
In conclusion, the exact amount of “thirds” in a cup is not clear without further context, but assuming that it refers to a fractional amount of a cup, one-third of a cup would be approximately 5 and 1/3 tablespoons or 2.7 fluid ounces, while two-thirds of a cup would be approximately 10 and 2/3 tablespoons or 5.3 fluid ounces. When measuring ingredients, it is important to use standard measuring cups and spoons to ensure accuracy.