Peanut and nut mixture contains 40% peanut. How much additional peanut mixture should be added to produce 8 lbs. of 50% peanut?
\[
\boxed{40 \%} + \boxed{100 \%} = \boxed{50 \%}
\]
\[
\boxed{8-x} \quad \boxed{x} \quad \boxed{8}
\]
\[
0.40(8 – x) + 1(x) = 0.50(8)
\]
\[
3.2 – 0.4x +x = 4
\]
\[
0.6x = 0.8
\]
\[
x=1.33 \leftarrow \text{answer}
\]