# Algebra calculations

#### machopicho

##### Well-known Member
Hello forum ...
Who you tell me how do I play an algebra with excel like this:
10
3
Attention, is not that simple ... I need this type of calculation to determine a useful range of a comparison of this kind in more than one formula:
10
3 <15 <20
3 = true

Thanks everyone!

### Excel Facts

Why does 9 mean SUM in SUBTOTAL?
It is because Sum is the 9th alphabetically in Average, Count, CountA, Max, Min, Product, StDev.S, StDev.P, Sum, VAR.S, VAR.P.
When the +/- is on the LHS of a less-than comparison , you don't need to test the minus part since m - n is always < m + n (when n is a positive number). So, you can just use m + n.

Similarly, when the +/- is on the RHS of a less-than comparison, you only need to use m - n.

Put together the final result with Excel's AND() function.

Yes, your reasoning is a good and i know it too, but I need this calculation to test a range:

10 +/-3 < 24

13< 24
7 < 24

13 - 7 = 6

6 is 25% of 24

this variation is accettable for me... if was 27% is not more accettable.
There is a way to calculate 10 +/- 3 in excel?
Thanks

The range covered by m +/- n is always 2*n.

Yes, your reasoning is a good and i know it too, but I need this calculation to test a range:

10 +/-3 < 24

13< 24
7 < 24

13 - 7 = 6

6 is 25% of 24

this variation is accettable for me... if was 27% is not more accettable.
There is a way to calculate 10 +/- 3 in excel?
Thanks

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