1: A barrel of water weighs 60 pounds. What must you put in it for it to weigh 40 pounds?

2: There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

3: How do you make the number 7 even without addition, subtraction, multiplication or division?

4: How can you drop an egg on a concrete floor without cracking it?

1. Since the barrel of water weighs 60 pounds, in order for the barrel of water to weigh 40 pounds, then one has to put holes into them. This will help reduce the weight.

2. Since the 20 people in the room has full sight of the entire room and can see everyone in it without turning their head or body, then the apple should be put on the head of someone. In this case, 19 people will be able to see it but the person having the apple on the head can't see it.

3. To make the number 7 even without the addition, subtraction, multiplication or division of numbers, then one has to remove S from the Seven. Removing S from Seven becomes EVEN.

4. The question here relates to the concrete floor. In this case, concrete floors are usually hard, tough and durable. Therefore, the egg can't crack the floor. Therefore, one should just drop it.

Read related link on:

link

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !

showing or having an insensitive and cruel disregard for others. (so basically being heartless)

hope this : )