document.write( "Question 134137: the sum of the last two digits of a three digit counting number is 7. the sum of the first two digits is 5. the middle digit is 4 times the first digit. what is the number? \n" ); document.write( "
Algebra.Com's Answer #98098 by oscargut(2103)\"\" \"About 
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let the digits x,y and z
\n" ); document.write( "then
\n" ); document.write( "y+z=7 (1st eq)
\n" ); document.write( "x+y=5 (2nd eq)
\n" ); document.write( "y=4x (3rd eq)\r
\n" ); document.write( "\n" ); document.write( "then using y = 4x and 2nd eq\r
\n" ); document.write( "\n" ); document.write( "5x=5
\n" ); document.write( "then x=1, y=4 and z=7-y=3
\n" ); document.write( "Answer: number is 143\r
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