$24-[2.4-\{0.24 \times 2-(0.024-?)\}]=22.0584$

Two baskets together have $640$ oranges. If $\frac{1}{5}$ of the oranges in the first basket are taken to the second basket,the number of oranges in both baskets becomes equal. The number of oranges in the first basket is:

$\frac{(0.6^{3}-0.1^{3}-0.4^{3}-3 \times 0.6 \times 0.1 \times 0.4)}{(0.6^{2}+0.1^{2}+0.4^{2}+0.6 \times 0.1+0.6 \times 0.4-0.1 \times 0.4)}$

$\frac{3}{7}$ of $\frac{49}{6}$ of $\frac{4}{7} = ?$

$21.9 \%$ of $(511.987 - 42.49) = \frac{?}{5.5}$

$(13.96)^{2} - (15.03)^{2} + (18.09)^{2} - 32.65 = ?$