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

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

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I am sure no one can have two things for dinner. what are they?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What begins with T, ends with T, and has T in it?

What does this rebus puzzle means ?

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?

Why do people go to bed?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

Why do we preferably have round manhole covers and not square ones?