The quotient arising from the division of $24446$ by a certain divisor is $79$ and the remainder is $35$. What is the divisor?

Two numbers,when divided by a certain divisor,leave remainders $43$ and $37$ respectively. When their sum is divided by the same divisor,the remainder is $13$. Find the divisor.

$1599 \times 199 \div 49 - 1398 + 3877 = ?$

$A$ and $B$ are positive integers. If $A + B + AB = 65$,then what is the difference between $A$ and $B$ (given $A, B \leq 15$)?

$36 + 451 \div 11$

$5999.99 + 1999 \div 39.99 \times 50.01 = ?$