What does this rebus riddle means ?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Can you solve the photo plexer logic ?

Find the next number in the series.
1 10 24 43 67 ?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

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

What is both possible and impossible at the same time?