document.write( "Question 306689: The average age of five boys is 15 years. A six boys joins them, making the average age 15 years and 6 months. What is the age of this sixth boy ?\r
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Algebra.Com's Answer #219437 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
The average age of five boys is 15 years.
\n" ); document.write( "The sum of their ages is 5*15 = 75 yrs.
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\n" ); document.write( "A sixth boys joins them, making the average age 15 years and 6 months.
\n" ); document.write( "The sum of their ages is now 6*15.5 = 93
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\n" ); document.write( "What is the age of this sixth boy ?
\n" ); document.write( "He is 93-75 = 18
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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