document.write( "Question 1089955: If martin is 8 years older than kris then how old is martin in 10 years when kris is 7 more than fourth of martin age? \n" ); document.write( "

Algebra.Com's Answer #704364 by jhunjiro(67) $\"\"$ $\"About$

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Find: how old is martin in 10 years
\n" ); document.write( "Let:
\n" ); document.write( "martin = x
\n" ); document.write( "kris = y
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\n" ); document.write( "Given:
\n" ); document.write( "is means equal
\n" ); document.write( "eq 1: $\"x=y%2B8\"$
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\n" ); document.write( "in 10 yrs means +10
\n" ); document.write( "eq 2: $\"y%2B10=%28x%2B10%29%2F4+%2B7\"$
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\n" ); document.write( "Solution
\n" ); document.write( "Substitute eq 1 to eq 2
\n" ); document.write( " $\"y%2B10=%28%28y%2B8%29%2B10%29%2F4+%2B7\"$
\n" ); document.write( " $\"4%28y%2B10%29=4%28%28y%2B8%29%2B10%2F4+%2B7%29\"$
\n" ); document.write( " $\"4y%2B40=%28%28y%2B8%29%2B10%29+%2B28\"$
\n" ); document.write( " $\"4y%2B40=%28y%2B18%29+%2B28\"$
\n" ); document.write( " $\"4y%2B40=y%2B46\"$
\n" ); document.write( " $\"3y%2B40=46\"$
\n" ); document.write( " $\"3y=6\"$
\n" ); document.write( " $\"y=2\"$ age of kris
\n" ); document.write( " $\"x=2%2B8\"$
\n" ); document.write( " $\"x=10\"$ age of martin
\n" ); document.write( " $\"x=10%2B10\"$
\n" ); document.write( " $\"x=20\"$ age of martin in 10 years!\r
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