Answers

2014-12-02T14:17:40+08:00
Sarah mass = 63kg

Her brother's mass (Nordin) = 63/3

Therefore

Nordin = 21

Add both

63 + 21

Is equal to

84 is the total mass of both

I hope it helps
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2014-12-02T17:20:44+08:00

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Suria's mass=63kg
Nordin=63kg/3=21kg

63+21=84kg

The total mass is 84kg. Hope this helps =)
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