document.write( "Question 792873: The average of 3 numbers is 154. The first number is twice the second and the second number is twice the third. The first number is- \n" ); document.write( "

Algebra.Com's Answer #480163 by stanbon(75887) $\"\"$ $\"About$

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The average of 3 numbers is 154. The first number is twice the second and the second number is twice the third.
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\n" ); document.write( "Equations:
\n" ); document.write( "(a+b+c)/3 = 154
\n" ); document.write( "a = 2b
\n" ); document.write( "b = 2c
\n" ); document.write( "---------------
\n" ); document.write( "Rearrange:
\n" ); document.write( "a + b + c = 462
\n" ); document.write( "a = 2b
\n" ); document.write( "c = b/2
\n" ); document.write( "------
\n" ); document.write( "Substitute for a and c and solve for \"b\":
\n" ); document.write( "2b + b + b/2 = 462
\n" ); document.write( "-----
\n" ); document.write( "(7/2)b = 462
\n" ); document.write( "b = 132
\n" ); document.write( "a = 2b = 264
\n" ); document.write( "c = b/2 = 66
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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\n" ); document.write( "\n" ); document.write( "The first number is- \n" ); document.write( "

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