What is the fastest way to double your money?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What is always in front of you but can’t be seen?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

It belongs to you, but other people use it more than you do. What is it?