Can you replace the question mark with the correct number?

Count the Triangle in the figure given below:

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

O_er_t_o_

Complete the missing letters of the given word.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?