Branched alkenes naming

Hey can someone explain why this is 3-ethyl-3-methylpentane and not
3-ethyl-3,3-dimethylpentane

Thanks


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Run your finger along the longest carbon chain; you get 5 carbons so that forms the pent- base.

Locate the side groups, they happen to be on the third carbon (either direction). One of the branches is 2 carbons long hence the ethyl group and the other is 1 carbon long, hence methyl. So overall, you get 3-ethyl-3-methylpentane