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How many pounds of candy that sells for $\$ 1.25$ per lb must be mixed with candy that sells for $\$ 0.75$ per $\mathrm{lb}$ to obtain $20 \mathrm{lb}$ of a mixture that should sell for $\$ 1.00$ per $\mathrm{lb}$ ?$\newline$$\square$ Ib of $\$ 1.25$-per-lb candy must be mixed with $\square$ lb of $\$ 0.75$-per-lb candy.$\newline$(Type integers or decimals.)