$(6990 \div 15) \times (468 \div 18) = ?$

The last digit,that is,the digit in the unit's place of the number $[(57)^{25}-1]$ is

How many numbers up to $200$ are divisible by both $2$ and $3$?

The sum of four numbers is $64.$ If you add $3$ to the first number,$3$ is subtracted from the second number,the third is multiplied by $3,$ and the fourth is divided by $3,$ then all the results are equal. What is the difference between the largest and the smallest of the original numbers?

$149.9 \%$ of $149.9 + 149.9 = ?$

$\sqrt{15 \times 163 \div 5 - 89} = ?$