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## Homework Statement

Both dams equally wide and equally high. The first dam holds back a very large lake, and the second dam holds back a narrow river.

## Homework Equations

Which dam has to be built more strongly?

a.) the first dam

b.) the second dam

c.) both

## The Attempt at a Solution

i know it would be the second dam that holds back a narrow river, but how can i prove it mathematically/algebraically?

how can i show the answer in ratio? -.-

i need your help please.

thanks!