Hi

How do I write a formula that can do the following:

If any number placed in B1 is higher or lower than (A1+C1)or (A1-C1) then
the font will turn Red. However, if it meets these conditions (falls between
this range) than the font stays black.

Below is an example of my sheet:
A1 B1 C1
SIZE SAMPLE 1 TOLERANCE +/-
33 1/2
43 1/2 1/8
23 1/4

It seemed very simple when I was asked to do this but I have not been able
to write the formula in the conditional format succesfully.
Thank you for your help!