Fill in each of the boxes with the numbers 1 to 9 so that the three horizontal equations are true.
Each number is used once; no repetition is allowed.
The calculations are done from left to right (i.e., 7-2x3=15, not 1) and may involve only positive numbers (so 5-3-7=-5 is not allowed).
_ _ _ _
_ _ _ _ _ | | - | | x | | = | |
| | x | | x | | = | | + | | + |_| + |_| + | | + |_|
|_| - |_| x |_| = |_| - |_| - |_|
(In reply to re: allternate solution
I'm not sure I agree with Charlie on this point. I think what has
to be positive is the individual numbers inside each box, not
necessarily the value of the equation.
" (so 5-3-7=-5 is not allowed)" in this example "-5" would be the
content of a box, and I suspect this is what is being disallowed.
But in "4 - 8 * 1 = 5 - 6 - 3" all the boxes are filled with
positive numbers. It's true the evaluation of the equation leads
to a negative number.
We'll have to ask Lisa which way fits what she was thinking.
Posted by Larry
on 2005-10-06 20:28:23