document.write( "Question 587367: What number between 20 and 30 is four times the sum of it's two digits? \n" ); document.write( "

Algebra.Com's Answer #374083 by josmiceli(19441) $\"\"$ $\"About$

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The number has to begin with $\"2\"$
\n" ); document.write( "Let the units digit = $\"n\"$
\n" ); document.write( "The value of the number is $\"+2%2A10+%2B+n+\"$
\n" ); document.write( "given:
\n" ); document.write( " $\"+20+%2B+n+=+4%2A%28+2+%2B+n+%29+\"$
\n" ); document.write( " $\"+20+%2B+n+=+8+%2B+4n+\"$
\n" ); document.write( " $\"+3n+=+20+-+8+\"$
\n" ); document.write( " $\"+3n+=+12+\"$
\n" ); document.write( " $\"+n+=+4+\"$
\n" ); document.write( "The number is 24
\n" ); document.write( "check:
\n" ); document.write( " $\"+4%2A%282+%2B+4%29+=+24+\"$
\n" ); document.write( "OK \n" ); document.write( "

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