Apples are sometimes sold by the unit (for example, "the small apples cost Bs. 2.00 for 3 apples; the large ones cost Bs. 1.00 each"), sometimes by mass (which is popularly confused with "weight"). In this case, kilograms would be used in most countries.
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If it weighs one kilogram on the moon, it will have about six times as many apples as a bag of 1 kilo apples on earth.
Kilograms are a measure of mass, not weight. Weight, in the metric system, is measured in Newtons. That said, kilograms are often used as the metric equivalent of pounds in common discourse. This can be done because the vast majority of measurements are made at the surface of the Earth, where the force of gravity is essentially constant. In that sense, there are 2.2 pounds in one kilogram, so a 3 pound bag of apples is a 1.36 kilo bag of apples
That depends what quantity you want to measure. -- Weight of the bag of apples . . . the scale in the store, newtons or pounds -- Mass of the bag of apples . . . . . balance scale, kilograms -- Length, width, or height of the bag . . . ruler, inches or centimeters -- Volume of the bag of apples . . . tub of water, graduated cylinder, liters or fluid ounces -- Time the apples stay fresh . . . calendar, clock, hours or days
You took 2 apples from 3 apples. You now have 2 apples, and there is one left in the bag or wherever you took the 2 apples from.