document.write( "Question 261437: How do you solve this equation Joe is 5 years older than Sally. In 15 years Joe will be 3 times as old as Sally is now. How old is Sally now? Hint: Write Joe's age now in terms of Sally's age now. Then write Joe's age in 15 years using the expression you just wrote for Joe's age now. Then using S for Sally's age now, write the equation in only one variable \"S\" and solve it. \r
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Algebra.Com's Answer #192618 by palanisamy(496)\"\" \"About 
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Let the age of Sally = x
\n" ); document.write( "Then the age of Joe = x+5
\n" ); document.write( "Also, in 15 years Joe will be 3 times as old as Sally is now.
\n" ); document.write( " x+5+15 = 3x
\n" ); document.write( " x+20 = 3x
\n" ); document.write( " 20 = 3x-x
\n" ); document.write( " 20 = 2x
\n" ); document.write( " 2x = 20
\n" ); document.write( " x = 20/2
\n" ); document.write( " x = 10 years
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