500
These are three of the Challenges of the Apollo 11 mission, highlighted in the book "Team Moon"
What is (pick 3 of these):
* Alarms (1202 alarm - executive overflow, too much for the computer to do because a switch was left on)
* Almost Empty (Almost ran out of fuel before they landed on the moon)
* Frozen Slug (caused pressure and temp to rise in the descent engine)
* First Steps (Space suits working really well)
* Wind (getting the Parkes Radio Telescope Dish to transmit the broadcast despite the wind)
* The Alien Environment (the Portable Life Support System needed to work well - which gave them oxygen, pressure and life)
* Images and Glitches (getting all images de-bugged so they can be developed quickly)
* Open Chutes (for landing, getting all 3 chutes open and working properly)