$9067 + 2065 - 8400 + 3045 - 1520 = ?$

If $\frac{1}{2}$ is added to a number and the sum is multiplied by $3,$ the result is $21.$ Then the number is (in $.5$)

$3648.24 + 364.824 \div ? - 36.4824 = 3794.1696$

$\frac{(0.188+0.077)^{2}+(0.188-0.077)^{2}}{0.188 \times 0.188+0.077 \times 0.077} = ?$

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

$N$ is the largest two-digit number which,when divided by $3, 4,$ and $6,$ leaves the remainders $1, 2,$ and $4$ respectively. What is the remainder when $N$ is divided by $5$?