2025 AMC 10A Problem 2

A box contains 10 pounds of a nut mix that is 50 percent peanuts, 20 percent cashews, and 30 percent almonds. A second nut mix containing 20 percent peanuts, 40 percent cashews, and 40 percent almonds is added to the box resulting in a new nut mix that is 40 percent peanuts. How many pounds of cashews are now in the box?

\textbf{(A)} 3.5 \qquad \textbf{(B)} 4 \qquad \textbf{(C)} 4.5 \qquad \textbf{(D)} 5 \qquad \textbf{(E)} 6

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.