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How many moles do you need for the final solution? That is M x L = moles = 0.03M x 0.050L = ?
So you need ? moles AgNO3. How many grams is that? That is g = moles x molar mass = x grams.
So your solution is 51 g/L. How many L must you take to arrive at x grams. That will be 51 g/L x yL = x grams.
Solve for yL. You have a number for x grams.