document.write( "Question 135048: A boy and his sister took it in turns to stand on a weighing machine with their pet dog. The brother and sister together weighed 85kg. The boy and the dog weighed 60.5kg. The girl and the dog weighed 49.5kg. Find the weighed in kilograms of the brother, the sister and their pet dog. \n" ); document.write( "
Algebra.Com's Answer #98878 by checkley77(12844)\"\" \"About 
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x+y=85
\n" ); document.write( "x+d=60.5
\n" ); document.write( "y+d=49.5
\n" ); document.write( "-----------------------
\n" ); document.write( "x+y+2d=110
\n" ); document.write( "seeing as x+y=85 we now replave (x=y) with 85
\n" ); document.write( "85+2d=110
\n" ); document.write( "2d=110-85
\n" ); document.write( "2d=25
\n" ); document.write( "d=25/2
\n" ); document.write( "d=12.5 kg. is the weight of the dog.
\n" ); document.write( "x+12.5=60.5
\n" ); document.write( "x=60.5-12.5
\n" ); document.write( "x=48 kg for the boy.
\n" ); document.write( "y+12.5=49.5
\n" ); document.write( "y=49.5-12.5
\n" ); document.write( "y=37 kg for the sister.
\n" ); document.write( "proofs:
\n" ); document.write( "48+37=85
\n" ); document.write( "85=85
\n" ); document.write( "48+12.5=60.5
\n" ); document.write( "37+12.5=49.5
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