document.write( "Question 857384: The difference of the digits of a 2-digit number is 5. If the digits are reversed, the new number is 7 greater than twice the original number. What is the units digit of the original number. \n" ); document.write( "

Algebra.Com's Answer #516579 by lwsshak3(11628) $\"\"$ $\"About$

You can put this solution on YOUR website!
The difference of the digits of a 2-digit number is 5. If the digits are reversed, the new number is 7 greater than twice the original number. What is the units digit of the original number.
\n" ); document.write( "***
\n" ); document.write( "let u=units digit
\n" ); document.write( "let t=tens digit
\n" ); document.write( "u-t=5
\n" ); document.write( "u=t+5
\n" ); document.write( "..
\n" ); document.write( "10u+t=2(10t+u)+7
\n" ); document.write( "10(t+5)+t=20t+2u+7
\n" ); document.write( "10(t+5)+t=20t+2(t+5)+7
\n" ); document.write( "10t+50+t=20t+2t+10+7
\n" ); document.write( "11t=33
\n" ); document.write( "t=3
\n" ); document.write( "u=t+5=8
\n" ); document.write( "units digit of the original number=8 \n" ); document.write( "

\n" );