document.write( "Question 573560: When Billy turned 14 years old, his father was 42 years old, which is three times Billy’s age at the time. Today is Billy’s birthday, and Billy’s father is now twice as old as Billy. How old is Billy? \n" ); document.write( "

Algebra.Com's Answer #368825 by Maths68(1474) $\"\"$ $\"About$

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Let
\n" ); document.write( "age of Bill now = b
\n" ); document.write( "age of Father now = f\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Billy’s father is now twice as old as Billy
\n" ); document.write( "f=2b..............(1)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let x years ago
\n" ); document.write( "Bill was
\n" ); document.write( "b-x = 14..............(2)
\n" ); document.write( "Father was
\n" ); document.write( "f-x = 42..............(3)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Put the value of f from (1) to (3)
\n" ); document.write( "f-x = 42..............(3)
\n" ); document.write( "2b-x=42...............(4)
\n" ); document.write( "Subtract (2) from (4)
\n" ); document.write( "2b-x=42...............(4)
\n" ); document.write( "-b+x = -14..............(2)
\n" ); document.write( "-----------
\n" ); document.write( "b=28
\n" ); document.write( "Put the value of b in (1)
\n" ); document.write( "f=2b..............(1)
\n" ); document.write( "f=2(28)
\n" ); document.write( "f=56\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "age of Bill now = b = 28 years old
\n" ); document.write( "age of Father now = f = 56 years old
\n" ); document.write( " \n" ); document.write( "

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