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A box full of chocolates weighs 12.650 kg. If the weight of the chocolates is 6 kg 350 g, the weight of the empty box is:
2850 g
2825 g
6300 g
6725 g
6300 g
Convert both weights to grams first: 12.650 kg = 12650 g and 6 kg 350 g = 6350 g. Subtracting 6350 g from 12650 g directly gives the answer.
Total weight of the box with chocolates = 12.650 kg. Weight of the chocolates = 6 kg 350 g.
Wempty=Wtotal−Wchocolates
Convert both weights to grams first: 12.650 kg = 12650 g and 6 kg 350 g = 6350 g. Subtracting 6350 g from 12650 g directly gives the answer.
Do not confuse kilograms and grams; convert everything to the same unit (grams) before performing subtraction to avoid decimal place errors.
Convert weights to a uniform unit
To make subtraction easier, convert kilograms to grams. Since 1 kg=1000 g, 12.650 kg=12650 g and 6 kg 350 g=(6×1000)+350=6350 g.
12.650 kg=12650 g,6 kg 350 g=6350 g
Calculate the empty box weight
Subtract the weight of the chocolates from the total weight of the full box.
12650 g−6350 g=6300 g
C is correct because the weight of the empty box is calculated as 12650 g−6350 g=6300 g.
This concept of unit consistency is frequently tested in physics problems involving force and mass calculations; always check your units before proceeding.
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