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In Olympic swimming pools there must always be 10 lanes. Although only 8 of these are used it still must have a lane rope between each lane, so there are 9 lane ropes used.
There are usually 50 meters in a Olympic sized swimming pool.
13
8
7
11-14
Eight
Since 1 gallon equals 90,840 drops and 1 Olympic sized swimming pool has 660,430 gallons, there are 59,993,461,200 drops in an Olympic size swimming pool.
41
8 or 6
22
20