Prove that the below maths equation is true.

8 + 8 = 91

What is the probability of getting five Mondays in a 31-day month?

If your uncle’s sister is not your aunt, what relation is she to you?

Solve the mathematical equation in the picture below.

What have one eye but still cannot see?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

If eleven plus two equals one, what does nine plus five equal?

What work can one never finish?