Guest Posted November 1, 2008 Report Share Posted November 1, 2008 What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first and second, and the last is three times the second? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted November 1, 2008 Report Share Posted November 1, 2008 (edited) is it 1349 The first number can only be 1 2 and 3 the second can only be 3 6 and 9 the third is either 4 from 1+3 or 8 from 2+6 the last can only be 3 because otherwise it would be larger than nine unless the last can be 18 or 27? that would just be confusing though Edited November 1, 2008 by Mad Twit Quote Link to comment Share on other sites More sharing options...
0 peace*out Posted November 1, 2008 Report Share Posted November 1, 2008 is it 1349 The first number can only be 1 2 and 3 the second can only be 3 6 and 9 the third is either 4 from 1+3 or 8 from 2+6 the last can only be 3 because otherwise it would be larger than nine unless the last can be 18 or 27? that would just be confusing though That is what i got too - i like this riddle!! Where'd u get it?? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted November 2, 2008 Report Share Posted November 2, 2008 b=3a c=a+b, which means c=4a [3a+a] d=3b, which means d=9a [3(a3)] thus the number is a,3a,4a,9a obviously a has to equal 1 for the number to be 4 digits. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted November 2, 2008 Report Share Posted November 2, 2008 (edited) What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first and second, and the last is three times the second? We have to take care that the 2nd digit is divisible by 3 and when multiplied by 3 should result in a single digit. Pretty simple! There is only one answer I have the answer - but don't want to spoil it for others. Edited November 2, 2008 by Shailu Quote Link to comment Share on other sites More sharing options...
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What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first and second, and the last is three times the second?
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