What is so fragile that saying its name breaks it?

What Does this text mean:

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In the image given, you can find several triangles. Can you count them all?

Find out the missing number in the picture attached:

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

What kind of storm is always in a rush?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?