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

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

Can you Find and name the hidden bird in the picture below ?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

When we see 2 but call 10?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?