**Question 1 from 11: If: 2 = 6; 3 = 12; 4 = 20; 5 = 30; 6 = 42 then 9 =?**

**Question 2 from 11: If you write all the numbers from 0 to 109, which number will repeat most of the time?**

**Question 3 from 11: The teacher gives the students fifteen numbers having an average of 15. Five of these numbers have an average of 5, four other numbers have an average of 4, three an average of 3, and two on average 2. What is the number left?**

**Question 4 from 11: What is the last digit of the 3^33 result?**

**Question 5 from 11: How many zeros will be at the end of the result?
99! = 1 * 2 *. . . * 99**

**Question 6 from 11: The product of two numbers is 1000. What is the smallest possible amount of these two numbers?**

**Question 7 from 11: What is the smallest number, which is 4 times the sum of its digits?**

**Question 8 from 11: If you write all the numbers from 0 to 999, which digit will be repeated the least?**

**Question 9 from 11: How many zeros will result at the end of the result by multiplying all 2-digit numbers?**

**Question 10 from 11: An apple seller has four weights with which he can weigh any weight (1kg, 2kg, 3kg, 4kg ... 40kg) from 1kg up to 40 kg. What is the heaviest weight used by the seller?**

**Question 11 from 11: An apple seller has four weights with which he can weigh any weight (1kg, 2kg, 3kg, 4kg ... 40kg) from 1kg up to 40 kg. What is the heaviest weight used by the seller?**