7
Q:

 A) 22 B) 33 C) 44 D) 55

Explanation:

In each circle,lower number equals the product of the top two numbers, subtracting 3 for the left hand circle, 4 for the middle, and 5 for the right hand circle.

Subject: Number Puzzles
Q:

What mathematical symbol can be placed between 5 and 9, to get a number greater than 5 and smaller than 9?

decimal point [i.e, 5.9]

Subject: Number Puzzles

856
Q:

Find a 10-digit number, where the first figure defines the count of zeros in this number, the second figure the count of numeral 1 in this number etc. At the end the tenth numeral character expresses the count of the numeral 9 in this number.

Sum of all numerals must be ten because each numeral stands for the count of other numerals and because this number shall have ten numerals. Beginning to choose reasonable numerals for the first figure you can come across the correct number: 6210001000.

Subject: Number Puzzles

814
Q:

Can you arrange 9 numerals - 1, 2, 3, 4, 5, 6, 7, 8 and 9 [using each numeral just once] above and below a division line, to create a fraction equaling to 1/3 [one third]?

$\inline \frac{5832}{17496}=\frac{1}{3}$

Subject: Number Puzzles

1070
Q:

Find the missing Number?

How ?

7*6 = 4 2
9*9 = 8 1
5*3 = 1 5
6*2 = 1 2

Subject: Number Puzzles

1354
Q:

 A) 90 B) 56 C) 34 D) 104