NASA lost a Mars Rover because half the team used metric units and the other half used English/American units

Sale 1

http://www.tf2outpost.com/trade/28076573 Sold for Pro KS Aussie RL Kit + 3 keys

B/O for Slouch was 32

B/O for Kit was 25

X = 21 + 3

X = 24

Kit http://backpack.tf/item/4726343973

Slouch http://backpack.tf/item/2390665935

Trade http://backpack.tf/profiles/76561198149968735/#!/compare/1460592000/1460678400 (Slouch is not shown)

Sale 2

http://www.tf2outpost.com/trade/28008191 Sold with 5 keys for EoF Shako

B/O for Slouch was 33

B/O for Shako was 32

X + 5 = 30

X = 25

Shako http://backpack.tf/item/564429755

Slouch http://backpack.tf/item/2390665935

Trade http://backpack.tf/profiles/76561198126790342/#!/compare/1459296000/1459382400

Mini for Shako

http://backpack.tf/vote/id/571d6b0983de6b7a6c2a82ad 29.5 keys, using 29.5

Sale 3

http://www.tf2outpost.com/trade/27484166 Sold for 26 keys

X = 26

Keys http://backpack.tf/profiles/76561198023329881/#!/compare/1458802800/1458950400

Slouch http://backpack.tf/item/2390665935

Sellers

http://www.tf2outpost.com/trade/28042731 30 keys

http://www.tf2outpost.com/trade/28089724 30 keys