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Help me out with the on at the top that says number system

Help me out with the on at the top that says number system-example-1

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11.2 + 3.4 = 14.6
Marcus dived down a total of 14.6 meters

He then swims up 6.2 meters

14.6 – 6.2 = 8.4

He is a total of 8.4 meters below the surface.
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