document.write( "Question 77232: Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo? \n" ); document.write( "
Algebra.Com's Answer #55368 by ptaylor(2198)\"\" \"About 
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Let x=his sister's age\r
\n" ); document.write( "\n" ); document.write( "Then (2x-4)=Ricardo's age\r
\n" ); document.write( "\n" ); document.write( "Now we are told that the sum of their ages is 20. So:\r
\n" ); document.write( "\n" ); document.write( "x+(2x-4)=20 get rid of parens
\n" ); document.write( "x+2x-4=20 add 4 to both sides
\n" ); document.write( "x+2x-4+4=20+4 collect like terms\r
\n" ); document.write( "\n" ); document.write( "3x=24 divide both sides by 3\r
\n" ); document.write( "\n" ); document.write( "x=8--------------------------------his sister's age\r
\n" ); document.write( "\n" ); document.write( "2x-4=2*8-4=16-4=12--------------------Ricardo's age\r
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\n" ); document.write( "\n" ); document.write( "CK\r
\n" ); document.write( "\n" ); document.write( "8+12=20
\n" ); document.write( "20=20
\n" ); document.write( "and
\n" ); document.write( "2*8-4=12
\n" ); document.write( "12=12\r
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\n" ); document.write( "\n" ); document.write( "Hope this helps-----ptaylor
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