solve 3 equations with 3 unknowns

[Valentina]

Hello everyone! I've already tried to solve in a block, it seems that something is missing, I'm waiting for your solutions, a lot of thanks 

• 

[Cornel]

One possible and quick solution would be without units of measurement:

[Fred_Kohlhepp]

Not sure what you did (POST YOU SHEET), but

[Valentina]

it worked, thanks

[LucMeekes]

Note that you need only three guess values, when solving for three variables. (Delta, h and R).

The values for X.A,B,C & Y.A,B and C are 'knowns', and can be placed above (outside of) the solve block.

Success!
Luc

[LucMeekes]

If you need to solve more problems like this, you can take the following approach:

Success!
Luc