document.write( "Question 592116: Five years ago, the age of the father was thrice the age of his son. In five years time, the age of father will be twice the age of his son at that time. Find their present ages. \n" ); document.write( "

Algebra.Com's Answer #375842 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+f+\"$ = Father's age now
\n" ); document.write( "Let $\"+s+\"$ = Son's age now
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+f+-+5+=+3%2A%28+s+-+5+%29+\"$
\n" ); document.write( "(2) $\"+f+%2B+5+=+2%2A%28+s+%2B+5+%29+\"$
\n" ); document.write( "--------------------
\n" ); document.write( "(1) $\"+f+-+5+=+3s+-+15+\"$
\n" ); document.write( "(1) $\"+3s+-+f+=+10+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+f+%2B+5+=+2s+%2B+10+\"$
\n" ); document.write( "(2) $\"+2s+-+f+=+-5+\"$
\n" ); document.write( "Subtract (2) from (1)
\n" ); document.write( "(1) $\"+3s+-+f+=+10+\"$
\n" ); document.write( "(2) $\"+-2s+%2B+f+=+5+\"$
\n" ); document.write( " $\"+s+=+15+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+3s+-+f+=+10+\"$
\n" ); document.write( "(1) $\"+3%2A15+-+f+=+10+\"$
\n" ); document.write( "(1) $\"+45+-+f+=+10+\"$
\n" ); document.write( "(1) $\"+f+=+45+-+10+\"$
\n" ); document.write( "(1) $\"+f+=+35+\"$
\n" ); document.write( "Father is 35 and Son is 15
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+f+-+5+=+3%2A%28+s+-+5+%29+\"$
\n" ); document.write( "(1) $\"+35+-+5+=+3%2A%28+15+-+5+%29+\"$
\n" ); document.write( "(1) $\"+30+=+3%2A10+\"$
\n" ); document.write( "(1) $\"+30+=+30+\"$
\n" ); document.write( "OK
\n" ); document.write( "(2) $\"+f+%2B+5+=+2%2A%28+s+%2B+5+%29+\"$
\n" ); document.write( "(2) $\"+35+%2B+5+=+2%2A%28+15+%2B+5+%29+\"$
\n" ); document.write( "(2) $\"+40+=+2%2A20+\"$
\n" ); document.write( "(2) $\"+40+=+40+\"$
\n" ); document.write( "OK \n" ); document.write( "

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