document.write( "Question 937783: The sum of a hundreds digit and the tens digit of a three digit number is 13. If the hundreds digit and the tens digit are interchanged, the new number is 90 less than the original number. It is given that the units digit of the original number is 4. Find the original number.\r
\n" ); document.write( "\n" ); document.write( "plz solve this question my simultaneous equations. Substitution or Elimination.
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Algebra.Com's Answer #571202 by lwsshak3(11628)\"\" \"About 
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The sum of a hundreds digit and the tens digit of a three digit number is 13. If the hundreds digit and the tens digit are interchanged, the new number is 90 less than the original number. It is given that the units digit of the original number is 4. Find the original number.
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\n" ); document.write( "let u=units digit
\n" ); document.write( "let t=tens digit
\n" ); document.write( "let h=hundredth digit
\n" ); document.write( "t+h=13
\n" ); document.write( "t=13-h
\n" ); document.write( "u=4
\n" ); document.write( "..
\n" ); document.write( "100h+10t+4-(100t+10h+4)=90
\n" ); document.write( "100h+10(13-h)+4-(100(13-h)+10h+4)=90
\n" ); document.write( "100h+130-10h+4-1300+100h-10h-4=90
\n" ); document.write( "200h-20h-1170=90
\n" ); document.write( "180h=1260
\n" ); document.write( "h=1260/180=7
\n" ); document.write( "t=13-h=6
\n" ); document.write( "original number: 764
\n" ); document.write( "..
\n" ); document.write( "Check: Interchange hundredth and tens digit
\n" ); document.write( "original-new number=764-674=90
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