document.write( "Question 617585: Anne and Ben have the total weight of 120 kilograms. Ben and Charlie have the total weight of 130 kilograms. Anne and Charlie have the total weight of 150 kilograms. What is the weight of Charlie? \n" ); document.write( "
Algebra.Com's Answer #388490 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Write an equation for each statement:
\n" ); document.write( ":
\n" ); document.write( "Anne and Ben have the total weight of 120 kilograms.
\n" ); document.write( "a + b = 120
\n" ); document.write( "b = (120-a)
\n" ); document.write( ":
\n" ); document.write( "Ben and Charlie have the total weight of 130 kilograms.
\n" ); document.write( "b + c = 130
\n" ); document.write( "Replace b with 120-a
\n" ); document.write( "120-a + c = 130
\n" ); document.write( "-a + c = 130 - 120
\n" ); document.write( "-a + c = 10
\n" ); document.write( "c - 10 = a
\n" ); document.write( ":
\n" ); document.write( " Anne and Charlie have the total weight of 150 kilograms.
\n" ); document.write( "a + c = 150
\n" ); document.write( "replace a with (c-10)
\n" ); document.write( "(c-10) + c = 150
\n" ); document.write( "2c = 150 + 10
\n" ); document.write( "2c = 160
\n" ); document.write( "c = 160/2
\n" ); document.write( "c = 80 kg is Charlie's weight\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );