If I lift 20 kilogram weight over my head ten times, then I have lifted 200 kilograms.
According to the question, each of the weight has a mass of 20 kilogram.
I have to lift this weight over my head ten times. Now i want to measure the total weight that i have lifted to the correct number of significant figures.
This now becomes; 20 kilogram * 10 = 200 kilograms.
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