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

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

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

I have a sore throat and a severe headache. I have four tablets with me that are identical to each other and they do not have any cover on them. There is no way I can identify which tablet serves what purpose. The only thing that I know is that two of these four tablets are for the throat and the remaining two are for the headache. To treat my condition, I must take 1 of each. What will I do now?

What happened when the wheel was invented?

I’m tall when I’m young, and I’m short when I’m old. What am I?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?