A certain sum amount to $1725$ at $15$ $\%$ per annum at simple interest and $1800$ in the same time at $20$ $\%$ per annum at simple interest. Find the sum.
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A certain sum amount to $1725$ at $15$ $\%$ per annum at simple interest and $1800$ in the same time at $20$ $\%$ per annum at simple interest. Find the sum.