
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
**p1.** Compute the greatest integer less than or equal to   $$ \frac{10 + 12 + 14 + 16 + 18 + 20}{21} $$  **p2.** Let $ A = 1$ . $B = 2$ ,  $C = 3$ ,  $...$ ,  $Z = 26$ . Find  $A + B +M + C$ .**p3.** In Mr. M's farm, there are  $10$  cows,  $8$  chickens, and  $4$  spiders. How many legs are there (including Mr. M's legs)?**p4.** The area of an equilateral triangle with perimeter  $18$  inches can be expressed in the form  $a\sqrt{b}{c}$  , where  $a$  and  $c$  are relatively prime and  $b$  is not divisible by the square of any prime. Find  $a + b + c$ .**p5.** Let  $f$  be a linear function so  $f(x) = ax + b$  for some  $a$  and  $b$ . If  $f(1) = 2017$  and  $f(2) = 2018$ , what is  $f(2019)$ ?**p6.** How many integers  $m$  satisfy  $4 < m^2 \le 216$ ?**p7.** Allen and Michael Phelps compete at the Olympics for swimming. Allen swims  $\frac98$  the distance Phelps swims, but Allen swims in  $\frac59$  of Phelps's time. If Phelps swims at a rate of  $3$  kilometers per hour, what is Allen's rate of swimming? The answer can be expressed as  $m/n$  for relatively prime positive integers  $m, n$ . Find  $m + n$ .**p8.** Let  $X$  be the number of distinct arrangements of the letters in "POONAM,"  $Y$  be the number of distinct arrangements of the letters in "ALLEN" and  $Z$  be the number of distinct arrangements of the letters in "NITHIN." Evaluate  $\frac{X+Z}{Y}$  :**p9.** Two overlapping circles, both of radius  $9$  cm, have centers that are  $9$  cm apart. The combined area of the two circles can be expressed as  $\frac{a\pi+b\sqrt{c}+d}{e}$  where  $c$  is not divisible by the square of any prime and the fraction is simplified. Find  $a + b + c + d + e$ .**p10.** In the Boxborough-Acton Regional High School (BARHS),  $99$  people take Korean,  $55$  people take Maori, and  $27$  people take Pig Latin.  $4$  people take both Korean and Maori,  $6$  people take both Korean and Pig Latin, and  $5$  people take both Maori and Pig Latin.  $1$  especially ambitious person takes all three languages, and and  $100$  people do not take a language. If BARHS does not oer any other languages, how many students attend BARHS?**p11.** Let  $H$  be a regular hexagon of side length  $2$ . Let  $M$  be the circumcircle of  $H$  and  $N$  be the inscribed circle of  $H$ . Let  $m, n$  be the area of  $M$  and  $N$  respectively. The quantity  $m - n$  is in the form  $\pi a$ , where  $a$  is an integer. Find  $a$ .**p12.** How many ordered quadruples of positive integers  $(p, q, r, s)$  are there such that  $p + q + r + s \le 12$ ?**p13.** Let  $K = 2^{\left(1+ \frac{1}{3^2} \right)\left(1+ \frac{1}{3^4} \right)\left(1+ \frac{1}{3^8}\right)\left(1+ \frac{1}{3^{16}} \right)...}$ . What is  $K^8$ ?**p14.** Neetin, Neeton, Neethan, Neethine, and Neekhil are playing basketball. Neetin starts out with the ball. How many ways can they pass 5 times so that Neethan ends up with the ball?**p15.** In an octahedron with side lengths  $3$ , inscribe a sphere. Then inscribe a second sphere tangent to the first sphere and to  $4$  faces of the octahedron. The radius of the second sphere can be expressed in the form  $\frac{\sqrt{a}-\sqrt{b}}{c}$  , where the square of any prime factor of  $c$  does not evenly divide into  $b$ . Compute  $a + b + c$ .


PS. You should use hide for answers. Collected [here](https://artofproblemsolving.com/community/c5h2760506p24143309).

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