How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

With the help clues provided in the image, can you find the 5 digit key?

Can you name some countries which do not have the alphabet 'A' in them?

What has no start, end, or centre?

Replace the question mark with the correct number in the below-given picture?

Count the number of triangles in the given picture.

I can write cow in 13 letters.

Can You?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?