Question

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. The total mass of the box is:

• A. 2.3 kg
• B. 2.34 kg
• C. 2.340 kg
• D. 2.3403 kg

Answer 1

The correct option is A 2.3 kg

Here, mass of the box, $m=2.3kg$
Mass of one gold piece, $m_1=20.15g=0.02015kg$
Mass of other gold piece, $m_2=20.17g=0.02017kg$
$\therefore$ Total mass = $m+m_1+m_2=2.3kg+0.02015kg+0.02017kg=2.34032kg$
As the result is correct only upto one place of decimal, therefore, on rounding off, we get Total mass $=2.3kg$