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[email protected]Rewards for Problems of the week:
5 points for the correct answer at your level; 10 points for the next level; 20 points each for 2+ levels up.
Question: Stacy has tickets to a concert that starts at 8:30 pm. If it’s currently 7:42 pm, then how much time does Stacy have to get to the concert before it starts?
Answer: 48 minutes
Solution: We can solve this problem by building up to 8:30. There are 18 minutes until 8:00 because 42 + 18 = 60 minutes, or an hour. There are 30 minutes from 8:00 until 8:30. So, Stacy has 18 + 30 = 48 minutes until the concert starts.
Upper Elementary:
Question: Maggie wants to buy a puzzle that costs $25. She has a 50% off coupon and $10. How much more money does Maggie need to get the puzzle?
Answer: $2.50
Solution: Half of $25 is $12.50. Maggie already has $10, so she needs $12.50 – $10 = $2.50 more.
Middle School:
Question: A red token is worth twice as much as an orange token. An orange token is worth 5 less a yellow token. A yellow token is worth 15 less than a green token. A green token is worth half as much as a blue token, and a blue token is worth B. How much is a yellow token worth in terms of B?
Answer: 0.5B – 15
Solution: If a blue token is worth B, then a green token is worth half of B, or 0.5B. A yellow token is worth 15 less, so that’s 0.5B – 15.
Algebra and Up:
Question: The formula for the temperature in Fahrenheit (F) in terms of the temperature in Celsius (C) is:
F = 9C/5 + 32
What is the formula for the temperature in Celsius in terms of the temperature in Fahrenheit?
Answer: C = 5/9(F – 32)
Solution: First, we subtract 32 from both sides and get F – 32 = 9C ÷ 5. Next, we multiply each side by 5 and get 5(F – 32) = 9C. After that, we divide each side by 9 and get 5/9(F – 32) = C. Finally, we flip it around and get C = 5/9(F – 32).
If every letter corresponds to a different digit and E = 5, what is Y?
Answer: 8
