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1. Small pipes matching one large pipe ●○○○○ 10 ptsA pipe with inside diameter $10''$ is to carry water from a reservoir to a small town in an arid land. Neglecting the friction and turbulence of the water against the inside of the pipes, what is the minimum number of $2''$-inside-diameter pipes of the same length needed to carry the same volume of water to the arid town?