How many grams are in half a cup of cat food?

There is 45 grams in half a cup of cat food. There is 65 grams in 3/4 of a cup of cat food and 5.4 kilograms in 12 lbs of cat food.

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Mass and volume are different notions and the units are not compatible. You need to know the density of the material to evaluate the mass because: mass = volume x density.

Also many types of cups exist through the damned non-SI units !