Ok guys, here are two question's for you.

1.What is the formula to compute the angle for our straight razors.
Give me an example please.

Lets assume that the blade width is 5/8ths and the thickness of the spine
is 1/8th.

2. Another question. lets say we just purchased an Ebay special. The prior owner for some reason has made a gradual taper to the width of the blade going from the heel at its widest, 5/8ths, to the toe of the blade, 4/8ths. Let assume he ground it down to remove some big nicks in the blade and he used an electric kitchen knife sharpener so the spine was not touched. Now the thickness of the spine is 1/8th.
Since we know that the ratio of the blade width divided by the thickness of the spine determines the angle and we know that the ratio must be constant for the entire length of the blade in order for the blade to lay flat on the hone, then, what thickness must the spine be at the toe of the blade in order to compensate for the decrease in the blade width?

5/8 divided by 1/8 = 5
4/8 divided by ? = 5
or .5/?=5
?=0.1 or 1/10th of an inch?

What would be a general purpose formula to solve this?

Sorry, my algebra is failing me,