To determine the elevation at the bottom of Lake Segundo, we need to multiply the depth of Lake Profondo (84 feet) by the fraction representing the depth of Lake Segundo (5/6).

When we multiply 84 by 5/6, we get:

84 * (5/6) = 420/6 = 70 feet.

Therefore, the elevation at the bottom of Lake Segundo is 70 feet.

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