What will come in the place of the question mark $(?)$ in the following equation?
$(21)^{2} - 3717 \div 59 = ? \times 8$

If $a+b+c=6, a^{2}+b^{2}+c^{2}=14$ and $a^{3}+b^{3}+c^{3}=36,$ then the value of $abc$ is

If $a^{2}+b^{2}-c^{2}=2(a-b-c)-3,$ then the value of $4a-3b+5c$ is

What will come in place of the question mark (?) in the following question?
$335.01 \times 244.99 \div 55 = ?$

If $1^{3}+2^{3}+\cdots+9^{3}=2025,$ then the value of $(0.11)^{3}+(0.22)^{3}+\cdots+(0.99)^{3}$ is close to

What approximate value will come in place of the question mark $(?)$ in the given equation? (You are not expected to calculate the exact value)
$\frac{1810}{24.05} \times 7.95 + 11.02 \times 18.88 = ? - 306$