The state competition is coming up! We’re already making great progress towards doing well at state – now we just need to keep up the skills until next weekend. So, here’s what I have in mind: every day from now until Thursday, I’ll post five problems on this blog. **You, the Mathlete, should solve everything you can and post your answers (along with your name) in the comments.** The next day, the answers will be posted so you can check your work.

Here’s the game, though: you will receive points for each question you answer correctly. Every day, I’ll post each person’s rankings along with the answers. Who will be the best Mathlete of all? We shall see….

1. I bought a one-year membership to the Abscissa Nature Park the other day for $99. The membership lets me visit the park for only $5, while non-members must pay $18. How many visits do I have to make this year to make buying the membership worth my money? *(10 pts.)*

2. Srikar is looking for books at the Broadmoor Library, and there are 70 fiction books and 80 nonfiction books on the nearest shelf. If no two books are the same, what is the probability that he will randomly choose one book of each kind without replacement? *(10 pts.)*

3. Sunjay is thinking of three positive integers. He tells his friend Robert that the sum of the first and second numbers is 8 less than the sum of the first and third, and 14 less than the sum of the second and third. If the second number is three times the first number, what is the sum of all three numbers? *(10 pts.)*

4. **Bonus.** What is the sum of 1726_{8} and 324_{6}? Express your answer in base 10. *(20 pts.)*

5. **Bonus.** The plot of land for Caroline’s new house is a trapezoid with two right angles, two sides of length 300 m, and a diagonal of length 500 m. What is the length of the other diagonal? Express your answer as a decimal to the nearest tenth of a meter. *(20 pts.)*?

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Srikhar Chilukuri:

#1 : 8

#2 : 28/447

#3 : 29

#4 : 4576

#5 : 331.7

Thanks for posting these !

1) 8 trips

2) 112/447

3) 29

4) 3416

5) How does an isosceles trapezoid have 2 right angles? Also, if it’s isosceles, wouldn’t the diagonals be the same?

It’s not an isosceles trapezoid. What’s your answer?

dunno, then.

Well, it is your yard 🙂

I posted the solutions this morning, I think they’re right before today’s quiz.