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"Hard" Riddles - Next 10 of 102.
Riddle:
I am something that you can you read but not see. I'm with you all the time but sometimes I'm hard to find. What am I?
Answer: Time.
Riddle:
I may be hard, I may be rough,
Bound in the round to claim a love.
What am I?
Answer: Diamond.
Riddle:
When I was 2, my sister was twice my age, and now am 18. How old is my sister?
Answer: 20.
Riddle:
I'm hard as a rock, and as light as a feather. I'm passed on to one another. Poor people need me, and rich people have me.
What am I?
Answer: Money.
Riddle:
I work very hard and never stop. When I stop, life is death. Who am I?
Answer: Your Heart. It has to work hard to pump blood to all parts of your body!
Riddle:
What's light as a feather and a few days after becomes hard as rock?
Answer: Snow.
Riddle:
When it is cold I expand and when it is warm I contract. What am I?
Answer: Water/ice.
Riddle:
Two girls were walking in the forest. It started raining very hard, so they took shelter in a nearby hut. When it stopped raining, they went out to look for food. The first girl went straight, and the second girl went left. The first girl found an apple tree, so she took a bite out of an apple. She was turned into an apple tree. The second girl didn't find anything, so she went to find her friend. When she got to the apple trees, a voice said, "Your friend has been turned into an apple tree. You have one guess to figure out which one is her, or she will be stuck as a tree forever." The second girl immediately knew which tree was her friend. How did she know?
Answer: It had recently rained so her friend was the only tree that wasn’t wet.
Riddle:
I fly in the air, But I am not always there. I cannot be touched, But I can be felt or held. Think very hard, But if you live near the equator, You may have a tough time seeing me. What am I?
Answer: Your breath.
Riddle:
Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn't so smart either. But now is not the time for regrets because you need to get away from these mutant zombies...fast. Can you use math to get you and your friends over the bridge before the zombies arrive? Alex Gendler shows how.
Answer: At first it might seem like no matter what you do, you're just a minute or two short of time, but there is a way. The key is to minimize the time wasted by the two slowest people by having them cross together. And because you'll need to make a couple of return trips with the lantern, you'll want to have the fastest people available to do so. So, you and the lab assistant quickly run across with the lantern, though you have to slow down a bit to match her pace. After two minutes, both of you are across, and you, as the quickest, run back with the lantern. Only three minutes have passed. So far, so good. Now comes the hard part. The professor and the janitor take the lantern and cross together. This takes them ten minutes since the janitor has to slow down for the old professor who keeps muttering that he probably shouldn't have given the zombies night vision. By the time they're across, there are only four minutes left, and you're still stuck on the wrong side of the bridge. But remember, the lab assistant has been waiting on the other side, and she's the second fastest of the group. So she grabs the lantern from the professor and runs back across to you. Now with only two minutes left, the two of you make the final crossing. As you step on the far side of the gorge, you cut the ropes and collapse the bridge behind you, just in the nick of time.
