The mass of a box is $2.3$ kg. Two marbles of masses $2.15$ g and $12.39$ g are added to it. Find the total mass of the box to the correct number of significant figures.

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Solution

$\begin{matrix} M a s s = m m_{1} = 2 \cdot 3 k g m_{2} = 2 \cdot 15 \times 10^{- 3} k g m_{3} = 12 \cdot 39 \times 10^{- 3} k g Required Answer = m_{1} + m_{2} + m_{3} \begin{matrix} = 2 \cdot 3 + 2 \cdot 15 \times 10^{- 3} + 12 \cdot 39 \times 10^{- 3} = 2 \cdot 31454 k g = 2 \cdot 3 k g \end{matrix} \end{matrix}$

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The mass of a box is 2.3kg. Two marbles of masses 2.15g and 12.39 g are added to it. Find the total mass of the box to the correct number of significant figures.

Mass=mm1=2⋅3kgm2=2⋅15×10−3kgm3=12⋅39×10−3kg Required Answer =m1+m2+m3=2⋅3+2⋅15×10−3+12⋅39×10−3=2⋅31454 kg=2⋅3kg

The mass of a box is $2.3$ kg. Two marbles of masses $2.15$ g and $12.39$ g are added to it. Find the total mass of the box to the correct number of significant figures.