What is the next number in this series?

4,12,84,3612....

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What seven-letter word has hundreds of letters in it?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Can you find out the missing number in the grid?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What does below chemistry rebus means?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?