Question

the mass of a box measured by a grocers balance is 2.3kg.two gold pieces of masses 20.15 g and20.17 g are added to the box.what is the total mass of the box?​

Answer 1

Answer:

total mass = 2.3 kg + 20.15g +20.17g

= 2300g + 20.15g + 29.17g

= 2340.32 g

Ans

Answer 2

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Mass of box = 2.3 Kg

$Mass \: of \: 1 ^{st} \: piece \: = 20.15g \: = \: \frac{20.15}{1000} = 0.02015kg$

$Mass \: of \: 2 ^{nd} \: piece \: = 20.17g \: = \: 0.02017 \: kg$

$\:Total \: Mass \: = \: 2.3 \: + \: 0.02015 \: + \: 0.0201 \\ = \: 2.32032 \: kg \\ = 2.3 \: kg$

Now,

$Difference \: of \: mass \: = 20.17 \: - \: 20.15 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: 0.02 \: g$