document.write( "Question 255078: A child is 1/3 the age of the older sibling. The sum of their ages is 16. How old is the younger child? \n" ); document.write( "
Algebra.Com's Answer #187379 by vksarvepalli(154)\"\" \"About 
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let the age of the child (younger one) be c\r
\n" ); document.write( "\n" ); document.write( "the age of the elder one be s\r
\n" ); document.write( "\n" ); document.write( "given c=1/3 s => s=3c\r
\n" ); document.write( "\n" ); document.write( "and c+s=16\r
\n" ); document.write( "\n" ); document.write( "so c+3c=16 => 4c=16\r
\n" ); document.write( "\n" ); document.write( "so c=4
\n" ); document.write( "and s=12\r
\n" ); document.write( "\n" ); document.write( "so the younger child is 4 years old
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