document.write( "Question 122178: 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 #89680 by jasonlin00(6)\"\" \"About 
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Ricardo is 12 years old.
\n" ); document.write( "(12+4)/2= 8
\n" ); document.write( "which is 20 years old in sum
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