The mass of a box measured by a grocer's balance is 2.300 kg .Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is the total mass of box to correct significant figures ?

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Solution

Mass of grocer’s box = 2.300 kg
Mass of gold piece I = 20.15g = 0.02015 kg
Mass of gold piece II = 20.17 g = 0.02017 kg
Total mass of the box = 2.3 + 0.02015 + 0.02017 = 2.34032 kg
In addition, the final result should retain as many decimal places as there are in the number with the least decimal places. Hence, the total mass of the box is 2.3 kg.

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