document.write( "Question 934481: the present age of father and son is 70 after 10 years the fathers age will be double of sons age how much is the present age of son \n" ); document.write( "

Algebra.Com's Answer #567470 by josmiceli(19441) $\"\"$ $\"About$

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Do you mean the sum of their ages is now $\"+70+\"$ ?
\n" ); document.write( "If so,
\n" ); document.write( "(1) $\"+f+%2B+s+=+70+\"$
\n" ); document.write( "You are told that $\"+10+\"$ years from now:
\n" ); document.write( "(2) $\"+f+%2B+10+=+2%2A%28+s+%2B+10+%29+\"$
\n" ); document.write( "----------------------------
\n" ); document.write( "(1) $\"+f+=+70+-+s+\"$
\n" ); document.write( "Substituting:
\n" ); document.write( "(2) $\"+70+-+s+%2B+10+=+2s+%2B+20+\"$
\n" ); document.write( "(2) $\"+3s+=+80+-+20+\"$
\n" ); document.write( "(2) $\"+3s+=+60+\"$
\n" ); document.write( "(2) $\"+s+=+20+\"$
\n" ); document.write( "The son is presently 20
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+f+=+70+-+20+\"$
\n" ); document.write( "(1) $\"+f+=+50+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+f+%2B+10+=+2%2A%28+s+%2B+10+%29+\"$
\n" ); document.write( "(2) $\"+50+%2B+10+=+2%2A%28+20+%2B+10+%29+\"$
\n" ); document.write( "(2) $\"+60+=+2%2A30+\"$
\n" ); document.write( "(2) $\"+60+=+60+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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