Problems of the Week - November 22 to November 28

Rewards for Problems of the week:

5 stars for the correct answer at your level; 10 stars for the next level; 20 stars for 2+ levels up.

Lower Elementary:

Question:  James trades a bottle cap for two thumb tacks. He trades each thumb tack for two paper clips. He trades each paper clip for two thimbles. Then, he trades each thimble for two bottle caps. How many more bottle caps does James have now than he did when he started?

Upper Elementary:

Question:  A truck that itself weighs four tons carries one ton of gravel. The driver unloads 500 pounds of gravel at a construction site. How many pounds do the truck and the gravel weigh in total now?

Middle School:

Question:  One red token is worth the same as two blue tokens. One blue token is worth the same as five orange tokens. One red token is worth the same as five pink tokens. How many orange tokens are worth the same as a pink token?

Algebra and Up:

Question:  Puppies sleep an average of 12 hours each day. Kittens sleep an average of 20 hours each day. If a puppy is 4 weeks older than a newborn kitten, then how old will the kitten be when the kitten and the puppy have gotten the same amount of sleep in total?

Challenge problem to take home. 5 stars for the correct answer. 

Andrei and Cristina would like to drink some tea, but they don't want to wait too long for it to cool down. They both make tea using half a mug of boiling water.

Andrei immediately fills the rest of his mug with water straight from the fridge. Cristina does the same, but after waiting ten minutes.

Whose tea has a lower temperature now?