Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Why do we preferably have round manhole covers and not square ones?

If 21x = 79x, what is the value of x?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

Which is the correct shadow of the bird?

Can you count the number of squares in the given picture?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?