$4433.764 - 2211.993 - 1133.667 + 3377.442 = ?$

$6 \frac{1}{15}-4 \frac{1}{12}+7 \frac{1}{3}-2 \frac{1}{6}=?$

$1523.89 \div 19.95 + 496.28 + 249.927 = ?$

The sum of squares of two numbers is $68$ and the square of their difference is $36$. The product of the two numbers is

The number of times $79$ must be subtracted from $50000$ so that the remainder is $43759$ is:

$P, Q$ and $R$ scored $581$ runs such that $4$ times $P$'s runs are equal to $5$ times $Q$'s runs,which are equal to $7$ times $R$'s runs. Find the difference between $P$'s runs and $R$'s runs.