How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

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

What is wrong in the below Picture?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

You see me once in June, twice in November, and not at all in May. What am I?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

A sundial has the fewest moving parts of any timepiece. Which has the most?

How can one talk without saying a single word?