document.write( "Question 1183842: Mor is 30years older than Sara, their total age is 60. How old is Sara ?\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #814315 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( "let Mor's age be $\"m\"$ and Sara's age $\"s\"$ \r
\n" ); document.write( "\n" ); document.write( "given:\r
\n" ); document.write( "\n" ); document.write( " $\"m=s%2B30\"$ .....eq.1
\n" ); document.write( " $\"m%2Bs=60\"$ .....eq.2
\n" ); document.write( "-----------------\r
\n" ); document.write( "\n" ); document.write( "substitute $\"m\"$ from eq.1 in eq.2\r
\n" ); document.write( "\n" ); document.write( " $\"s%2B30%2Bs=60\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2s=60-30\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2s=30\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"s=15\"$ \r
\n" ); document.write( "\n" ); document.write( "then\r
\n" ); document.write( "\n" ); document.write( " $\"m=15%2B30\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"m=45\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Mor is $\"45\"$ and Sara is $\"15\"$ years old.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );