Problems of the Week - March 14 to March 20

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: It takes 5 batteries to power 1 flashlight. It takes 4 batteries to power 1 radio. Which of the following requires more batteries: 3 flashlights and 2 radios or 4 flashlights and 1 radio?

Upper Elementary:

Question: Brandon finds 4 pounds and 8 ounces of wood for a campfire. Emma finds 5 pounds and 11 ounces. Luis finds 9 pounds and 3 ounces. How much campfire do they have in total?

Middle School:

Question: An unroasted marshmallow has a volume of 0.25π cubic inches. After Andrew roasts the marshmallow over a campfire, its volume is 150% its original volume. What is the post-roast volume of the marshmallow?

Algebra and Up:

Question: A triangular prism-shaped tent has a rectangular base that is 6 feet wide and 8 feet long. The isosceles triangular sides have bases that are 6 feet wide and edges that are 5 feet in length. If all the walls of the tent are pulled perfectly flat, then what is the volume of the tent?

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

Each figure above is formed by surrounding a row of black blocks with white blocks. How many white blocks are needed to surround a row of 10 black blocks?