Correctness of cells where multiple solutions are possible

In CL, how would I allow for multiple correct solutions in cells? For example, if the value of cell(1,2) has to be twice the value of cell(1,1) no matter the value of cell(1,1), how would I do that?

Calculate that and refer to it dynamically. Something like:

ans = numericValue("2*${this.cellNumericValue(1,1)}")