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

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

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you solve the photo plexer logic ?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What has lots of eyes, but can’t see?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

What goes up but never comes down?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?