A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

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?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Different lights make me strange by changing me into different sizes. What am I?

People put me on the table and cut me but do not eat me. What am I?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you place three balls such that the equation shown in the picture holds true?

Can you count the number of triangles in the given figure?