yarKylaconnh7 yarKylaconnh7
  • 24-04-2017
  • Mathematics
contestada

Sarah, amy and liam stand on some weighing scales two at a time.here are the measurements:sarah and amy 70kgsarah and liam 80kgliam and amy 80kghow much does liam weigh?

Respuesta :

irspow
irspow irspow
  • 24-04-2017
a+s=70, s+l=80, l+a=80

from the first s=70-a which makes the second:

70-a+l=80

-a+l=10

a=l-10 which makes the third:

l+l-10=80

2l-10=80

2l=90

l=45

So Liam weighs 45 kg.
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