A. How many odd numbers are in the row of numbers from 4 to 38?

B. The sides of the many sided triangle are equal three successively situated numbers, but sum of all sides is 18 cm. Find the length of every side of the triangle.

C. I have thought a number. I have added 17 to this number, then this sum I multiply to 5 and I have got 95. Which number I have thought?

D. Write with three numbers 2, that the sum will be 1 [2 - 2: 2 = 1]
 

1.) with three numbers 2, that the sum will be 2
2.) with four numbers 2 , that the sum will be 2
3.) with three numbers 2, that the sum will be 3
4.) with four numbers 2, that the sum will be 3
5.) with four numbers 2, that the sum will be 5
6.) with four numbers 2, that the sum will be 4 
7.) with seven numbers 2, that the sum will be 7
8.) with seven numbers 3, that the sum will be 7
9.) with five numbers 3, that the sum will be 31
10.) with four numbers 4, that the sum will be 1
11.) with four numbers 4, that the sum will be 7
12.) with five numbers 5, that the sum will be 8
13.) with four numbers 5, that the sum will be 6
14.) with four numbers 9, that the sum will be 8
15.) with three numbers 9, that the sum will be 10
16.) with five numbers 9, that the sum will be 10
17.) with four numbers 9, that the sum will be 18
18.) with five numbers 2, that the sum will be 28
19.) with five numbers 3, that the sum will be 31
20.) with five numbers 5, that the sum will be 31
21.) with five numbers 3, that the sum will be 100
22.) with six numbers 7, that the sum will be 100
23.) with six numbers 1, that the sum will be101
24.) with six numbers 9, that the sum will be 101
25.) with four numbers 2, that the sum will be 111