Reddit reviews Puzzles in Math and Logic (Dover Recreational Math)
We found 1 Reddit comments about Puzzles in Math and Logic (Dover Recreational Math). Here are the top ones, ranked by their Reddit score.
a, c and f can't be 0 because they are the first digit. As already stated, b and e can't be zero. If b or e were 0 then i would be zero.
Now, you have a two digit number, ab, multiplied by a 3 digit number, cde, these make a 4 digit number, fghi. So, a and c can only be 2, 3 or 4. In fact a and c can't be 3 and 4 together. One of them has to be 2. So a and c are 2 and 3 OR 2 and 4. This also means that f is 6, 7 8 or 9.
Let me just explain that if and and c were any bigger than 2, 3 or 4 then fghi would be a 5 digit number.
At this point it's getting late, I would try a little guessing and trial and error. I did google the problem and discover it's in this book http://www.amazon.com/Puzzles-Math-Logic-Dover-Recreational/dp/048622256X
Here's my advice. Buy the book. It's 1c plus shipping on Amazon. If your teacher has given you this problem, chances are he'll give you another from the book in a month's time.