document.write( "Question 947559: The sum of ages of son and father 5 years ago was 46 years. after 8 years the father 's age will be twice the age of son. Find the present age of father \n" ); document.write( "

Algebra.Com's Answer #578203 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+s+\"$ = son's age now
\n" ); document.write( "Let $\"+f+\"$ = father's age now
\n" ); document.write( "---------------------------
\n" ); document.write( "(1) $\"+s+-+5+%2B+f+-+5+=+46+\"$
\n" ); document.write( "(2) $\"+f+%2B+8+=+2%2A%28+s+%2B+8+%29+\"$
\n" ); document.write( "---------------------------
\n" ); document.write( "(1) $\"+f+%2B+s+=+46+%2B+10+\"$
\n" ); document.write( "(1) $\"+f+%2B+s+=+56+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+f+%2B+8+=+2s+%2B+16+\"$
\n" ); document.write( "(2) $\"+f+-+2s+=+16+-+8+\"$
\n" ); document.write( "(2) $\"+f+-+2s+=+8+\"$
\n" ); document.write( "-------------------
\n" ); document.write( "Subtract (2) from (1)
\n" ); document.write( "(1) $\"+f+%2B+s+=+56+\"$
\n" ); document.write( "(2) $\"+-f+%2B+2s+=+-8+\"$
\n" ); document.write( "---------------------
\n" ); document.write( " $\"+3s+=+48+\"$
\n" ); document.write( " $\"+s+=+16+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+f+%2B+s+=+56+\"$
\n" ); document.write( "(1) $\"+f+%2B+16+=+56+\"$
\n" ); document.write( "(1) $\"+f+=+40+\"$
\n" ); document.write( "At present, the father is 40
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+f+%2B+8+=+2%2A%28+s+%2B+8+%29+\"$
\n" ); document.write( "(2) $\"+40+%2B+8+=+2%2A%28+16+%2B+8+%29+\"$
\n" ); document.write( "(2) $\"+48+=+2%2A24+\"$
\n" ); document.write( "(2) $\"+48+=+48+\"$
\n" ); document.write( "OK
\n" ); document.write( "(1) $\"+f+%2B+s+=+56+\"$
\n" ); document.write( "(1) $\"+40+%2B+16+=+56+\"$
\n" ); document.write( "(1) $\"+56+=+56+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );