I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Which is the smallest number that you can write using all the vowels exactly once?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

You can hear me, but you can't touch or see me.

What am I?

Can you count the number of children in the picture below

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Find the next number in the series

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