### BAB::Employee Parking Garage on 1st Ave. in Phoenix, Arizona

These signs were found on the entrance to a parking garage on 1st Ave. in Phoenix, Arizona.

The top sign says...

```   +------------------------------------------------+
| Clearance 6'8'' Maximum Vehicle Load 6000 Lbs. |
+------------------------------------------------+
```

Upon first seeing the clearance/load sign, we immediately thought about having a `pounds_to_tons` conversion function, but we ended up with off-by-one math.

```   pounds_to_tons(6000) = 8 - 6 (+ 1)

observe...
6000 pounds equals 3 short tons (2.68 long tons)
8 - 6 = 2
```

Math was found when the informational sign was taken into consideration with the word "ten" converted into the number 10.

```   +------------------------------------------------+
| Clearance 6'8'' Maximum Vehicle Load 6000 Lbs. |
+------------------------------------------------+

+----------------------------------------------+
|       Maricopa County Employee Parking       |
| + Do not park in reserved/designated areas   |
|   without permit                             |
| + Do not back into or drive through spaces   |
| + Do not block driveway or access            |
| + Do not grant access/scan for others        |
| + No foot traffic on entrance gate arms      |
| + Speed limit is ten (10) miles per hour     |
| + Drive with headlights on                   |
| + Park at your own risk                      |
|                                              |
|   coordinator or protective services         |
|   at (602) 506-3700 / 24 hrs                 |
+----------------------------------------------+

the numbers are:  6   8   6000  10  10  602  506  3700  24

A key to getting started was to see that 100 from 3700 is the
square number 3600 and that the square root 3600 (i.e. 60) is
a factor of 6000 (6000 / 60 = 100).  Another key was to see
that the difference between 602 and 506 was only four away
from being 100.

the math is:  6000 / sqrt(3700 - 10 * 10) = 602 - 506 + (8 - 24 / 6)

observe...
left-hand side:
10 * 10 = 100
3700 - 100 = 3600
sqrt(3600) = 60
6000 / 60 = 100

right-hand side:
602 - 506 = 96
24 / 6 = 4
8 - 4 = 4
96 + 4 = 100
```

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 19 July 2007