Help with constraints in solver

largeselection

Active Member
Joined
Aug 4, 2008
Messages
356
Hello again,

this time I have a question regarding excel's "solver" add-in.

Basically I want to hit a certain number which is the sum of some numbers times some other numbers.

Here's the example:
<X>
A) 1 * (BLANK)
B) 14 * (BLANK)
C) 77 * (BLANK)

I'm using solver to fill in the (BLANK)s.
<X> = sum (A,B,C) and I want the value of X to be say 1000

However there are constraints. All the (BLANK)s need to be multiple of 12s. In addition, they need to be positive integers only. Also, they need to go in descending order so (BLANK) A must be > (BLANK) B must be > (BLANK) C.

I would like to get all the way to C, but if I can only get to B that is ok. (The real example extends to J so I'm saying that the chain can have zeros for H, I, J, as an example, but ideally would go out as far as possible).

Also, I need <X> the value of X to be near 1000, not exactly 1000. How is the best way to accomplish this either via solver or other?
 

Excel Facts

Which Excel functions can ignore hidden rows?
The SUBTOTAL and AGGREGATE functions ignore hidden rows. AGGREGATE can also exclude error cells and more.

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