### BARS::I-19 Exit on Eastbound I-10 in Tucson, Arizona

These road signs are on eastbound I-10 in Tucson, Arizona.

The road signs say...

```   +-----------+ +----------+ +------------+
| I-10 East | | Exit 261 | |  Exit 260  |
|  El Paso  | | 6th Ave  | | I-19 South |
+-----------+ | 4th Ave  | |  Nogales   |
|  1 Mile  | +------------+
+----------+
```
```   the numbers are:  10  261  6  4  1  19  260

the math is:  (6 + 4 + 10) / (1 + 19) = 261 - 260

observe...
6 + 4 + 10 = 20
1 + 19 = 20
20 / 20 = 1
261 - 260 = 1

[solve for n]  (6 + n + 10) / (1 + 19) = 261 - 260
```
##### Update::2009.02.22

When MathBabbler decided his Pi Day 2009 roadtrip would be to Nogales, Arizona, via Casa Grande and Tucson, he created a collection of BARS that he already had from Tucson. This BARS was one of the seven BARS added to the Tucson collection so he looked from some more math and found the following.

```   the numbers are:  10  261  6  4  1  19  260

more math:  sqrt(sqrt((261 + 260 + 6 + sqrt(4))) - 19) - log(10) = 1

more math:  (6 / sqrt(4))^(261 - 260 + 1) + 10 = 19

rsAgeEval:  6 * 4 + 19 + 10 - 1 - 261 + 260 = 51
* MathBabbler was 51 years young when he found this equation.

rsAgeEval:  sqrt((261 + 260 + 6 + sqrt(4))) + 19) + 10 - 1 = 51
* MathBabbler was 51 years young when he found this equation.

rsPhiEval:  ((261 - 260) + sqrt(1 + 4)) / (6 / sqrt(19 - 10)) = Phi
* Phi is the golden ratio and it approximates 1.61803399

rs42Eval:  (sqrt((261 + 260 + 6 + sqrt(4))) + 19) * log(10) * 1 = 42
* 42 is the "Answer to Life, the Universe, and Everything"

rsHwyEval:  log(10) * 19 - (6 / sqrt(4))^(261 - 260 + 1) = 10
* These road signs were found on I-10.
```

There has to be a rsPiEval, but to date MathBabbler has not been able to find it.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 01 October 2007 