document.write( "Question 726668: The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. Find the average age of remaining students? \n" ); document.write( "

Algebra.Com's Answer #444765 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The average age of 30 students in a class is 12 years.
\n" ); document.write( " The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years.
\n" ); document.write( "Find the average age of remaining students?
\n" ); document.write( ":
\n" ); document.write( "30 - 5 - 5 = 20 remaining students
\n" ); document.write( ":
\n" ); document.write( "Let x = av age of the remaining students
\n" ); document.write( ":
\n" ); document.write( " $\"%28%2820x+%2B+5%2814%29+%2B+5%2810%29%29%29%2F30\"$ = 12
\n" ); document.write( ":
\n" ); document.write( " $\"%28%2820x+%2B+70+%2B+50%29%29%2F30\"$ = 12
\n" ); document.write( "multiply both sides by 30
\n" ); document.write( "20x + 120 = 30(12)
\n" ); document.write( "20x = 360 - 120
\n" ); document.write( "20x = 240
\n" ); document.write( "x = 240/20
\n" ); document.write( "x = 12 yrs, av age of remaining students \n" ); document.write( "

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