document.write( "Question 565943: sana is senior to mona by 18 years. after 6 years sana will be twice as old as mon. find mona's present age? \n" ); document.write( "

Algebra.Com's Answer #366024 by Maths68(1474) $\"\"$ $\"About$

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Let
\n" ); document.write( "Present age of Sana = s
\n" ); document.write( "Present age of Mona = m\r
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\n" ); document.write( "\n" ); document.write( "Sana is senior to Mona by 18 years
\n" ); document.write( "s=m+18............(1)\r
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\n" ); document.write( "\n" ); document.write( "After 6 years
\n" ); document.write( "Sana will be = s+6
\n" ); document.write( "Mona will be = m+6\r
\n" ); document.write( "\n" ); document.write( "Then\r
\n" ); document.write( "\n" ); document.write( "Sana will be twice as old as Mona
\n" ); document.write( "(s+6)=2(m+6)
\n" ); document.write( "s+6=2m+12
\n" ); document.write( "s=2m+12-6
\n" ); document.write( "s=2m+6.............(2)
\n" ); document.write( "Put the value of s from (2) to (1)
\n" ); document.write( "2m+6=m+18
\n" ); document.write( "2m-m=18-6
\n" ); document.write( "m=12
\n" ); document.write( "Put the value of m in (1)
\n" ); document.write( "s=m+18
\n" ); document.write( "s=12+18
\n" ); document.write( "s=30\r
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\n" ); document.write( "\n" ); document.write( "Present age of Sana = s = 30 years old
\n" ); document.write( "Present age of Mona = m = 12 years old
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