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A local grocer wants to mix candied pecans, priced at $\$ 14.00 /$ pound (lb) and candied cashews, priced at $\$ 10.00 / \mathrm{lb}$. How many pounds of candied cashews must he mix with $8$ lbs of candied pecans to make a mixture that costs $\$ 12.50 / \mathrm{lb}$ ? (Round the answer to the nearest tenth of a pound.)