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The mass of a box measured by a grocer's...

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17g are added to the box. What is (a) total mass of the box (b) the difference in masses of gold pieces to correct significant figures.

A

2.3 kg

B

2.34 kg

C

2.340 kg

D

2.3403 kg

Text Solution

Verified by Experts

The correct Answer is:
A
Here, mass of the box, `m=2.3kg`
Mass of one gold piece, `m_(1)=20.15g=0.02015kg` ltBrgt Mass of the other gold piece, `m_(2)=20.17g=0.02017kg`
`therefore` Total mass `=m+m_(1)+m_(2)` ltb rgt `=2.3kg+0.02015kg+0.02017kg=2.34032kg`
As the result is correct only upto one place of decimal, therefore, on rounding off, we get
Total mass=2.3 kg
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