How many triangles are there on the puzzle below?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Solve the mathematical equation in the picture below.

What is next number in the pattern below:

131 517 192 123 ?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

What number divided by 4 is the same as that number minus 4?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?