document.write( "Question 518202: The sum of the digits is 12.
\n" ); document.write( "The digit in the tousandths place is 3 times the digit in the tens place.
\n" ); document.write( "To the nearest ten, the number rounds to 30.
\n" ); document.write( "The digit in the tenths place is one more than the digit in the hundredths place.
\n" ); document.write( "What is the number?
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Algebra.Com's Answer #345173 by ankor@dixie-net.com(22740)\"\" \"About 
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The three digits: a, b, c, d
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\n" ); document.write( "\"The sum of the digits is 12.\"
\n" ); document.write( "a + b + c + d = 12
\n" ); document.write( ":
\n" ); document.write( "\"The digit in the thousandths place is 3 times the digit in the tens place.\"
\n" ); document.write( "a = 3c
\n" ); document.write( "\"The digit in the tenths place is one more than the digit in the hundredths place.\"
\n" ); document.write( "c = b + 1
\n" ); document.write( "or
\n" ); document.write( "b = (c-1)
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\n" ); document.write( "a + b + c + d = 12
\n" ); document.write( "Replace a and b
\n" ); document.write( "3c + (c-1) + c + d = 12
\n" ); document.write( "5c + d = 12 + 1
\n" ); document.write( "5c + d = 13
\n" ); document.write( "Assume that c has to equal 2, therefore
\n" ); document.write( "5(2) + d = 13
\n" ); document.write( "10 + d = 13
\n" ); document.write( "d = 13 - 10
\n" ); document.write( "d = 3
\n" ); document.write( "find the rest of the digits
\n" ); document.write( "a = 3(2) = 6
\n" ); document.write( "b = 2-1 = 1
\n" ); document.write( "c = 2
\n" ); document.write( "d = 3
\n" ); document.write( "then
\n" ); document.write( "6123 is the number
\n" ); document.write( ":
\n" ); document.write( "Assume that c has to equal 1, therefore
\n" ); document.write( "5(1) + d = 13
\n" ); document.write( "5 + d = 13
\n" ); document.write( "d = 13 - 5
\n" ); document.write( "d = 8
\n" ); document.write( "find the rest of the digits
\n" ); document.write( "a = 3(1) = 3
\n" ); document.write( "b = 1-1 = 0
\n" ); document.write( "c = 1
\n" ); document.write( "d = 8
\n" ); document.write( "then
\n" ); document.write( "3018 is the number
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\n" ); document.write( "\"To the nearest ten, the number rounds to 30.\" Not sure what bearing this has on this problem.
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