How can you drop a raw egg from a height onto a concrete floor without cracking it?

I have Rs.50 and I spend it in the way as below.

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

Can you place three balls such that the equation shown in the picture holds true?

What's a single-digit number with no value?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

O_er_t_o_

Complete the missing letters of the given word.