Mrs. Jones is pouring orange juice into four identical glasses for her four sons. She fills the first three glasses completely full but runs out of juice when the fourth glass is only $\frac{1}{3}$ full. What fraction of a glass must Mrs. Jones pour from each of the first three glasses into the fourth glass so that all four glasses will have the same amount of juice?
Carlos went to a sports store to buy running shoes. Running shoes were on sale, with prices reduced by $20 %$ on every pair of shoes. Carlos also knew that he had to pay a $7.5 %$ sales tax on the discounted price. He had $43. What is the original (before discount) price of the most expensive shoes he could afford to buy?
A 3-4-5 right triangle is inscribed in circle $A$, and a 5-12-13 right triangle is inscribed in circle $B$. What is the ratio of the area of circle $A$ to the area of circle $B$ ?
Jackson's paintbrush makes a narrow strip with a width of 6.5 millimeters. Jackson has enough paint to make a strip 25 meters long. How many square centimeters of paper could Jackson cover with paint?
Maddy and Lara see a list of numbers written on a blackboard. Maddy adds 3 to each number in the list and finds that the sum of her new numbers is 45 . Lara multiplies each number in the list by 3 and finds that the sum of her new numbers is also 45 . How many numbers are written on the blackboard?
Let $L_{1}=1, L_{2}=3$, and $L_{n+2}=L_{n+1}+L_{n}$ for $n \geq 1$. How many terms in the sequence $L_{1}, L_{2}, L_{3}, \cdots, L_{2023}$ are even?
Square $A B C D$ is rotated $20^{\circ}$ clockwise about its center to obtain square $E F G H$, as shown below. What is the degree measure of $\angle E A B$ ?
What is the units digit of $$ 2022^{2023}+2023^{2022} ? $$
The numbers 16 and 25 are a pair of consecutive positive perfect squares whose difference is 9 . How many pairs of consecutive positive perfect squares have a difference of less than or equal to 2023 ?
You are playing a game. A $2 \times 1$ rectangle covers two adjacent squares (oriented either horizontally or vertically) of a $3 \times 3$ grid of squares, but you are not told which two squares are covered. Your goal is to find at least one square that is covered by the rectangle. A "turn" consists of you guessing a square, after which you are told whether that square is covered by the hidden rectangle. What is the minimum number of turns you need to ensue that at least one of your guessed squares is covered by the rectangle?
Suzanne went to the bank and withdrew 800. The teller gave her this amount using 20 bills, 50 bills, and 100 bills, with at least one of each denomination. How many different collections of bills could Suzanne have received?
When the roots of the polynomial $$ P(x)=\prod_{i=1}^{10}(x-i)^{i} $$ are removed from the real number line, what remains is the union of 11 disjoint open intervals. On how many of those intervals is $P(x)$ positive?
What is the area of the region in the coordinate plane defined by the inequality $$ ||x|-1|+||y|-1| \leq 1 ? $$
How many ordered pairs of integers ( $m, n$ ) satisfy the equation $$ m^{2}+m n+n^{2}=m^{2} n^{2} ? $$
What is the least positive integer $m$ such that $m \cdot 2!\cdot 3!\cdot 4!\cdot 5!\cdots 16!$ is a perfect square?
Define an upno to be a positive integer of 2 or more digits where the digits are strictly increasing moving left to right. Similarly, define a downno to be a positive integer of 2 or more digits where the digits are strictly decreasing moving left to right. For instance, the number 258 is an upno and 8620 is a downno. Let $U$ equal the total number of upnos and let $d$ equal the total number of downnos. What is $|U-D|$ ?
A rectangular box $\mathcal{P}$ has distinct edge lengths $a, b$, and $c$. The sum of the lengths of all 12 edges of $\mathcal{P}$ is 13 , the sum of the areas of all 6 faces of $\mathcal{P}$ is $\frac{11}{2}$, and the volume of $\mathcal{P}$ is $\frac{1}{2}$. What is the length of the longest interior diagonal connecting two vertices of $\mathcal{P}$ ?
Suppose $a, b$, and $c$ are positive integers such that $$ \frac{a}{14}+\frac{b}{15}=\frac{c}{210} . $$ Which of the following statements are necessarily true?
Sonya the frog chooses a point uniformly at random lying within the square $[0,6] \times[0,6]$ in the coordinate plane and hops to that point. She then randomly chooses a distance uniformly at random from $[0,1]$ and a direction uniformly at random from \{north, south east, west\}. All he choices are independent. She now hops the distance in the chosen direction. What is the probability that she lands outside the square?
Four congruent semicircles are drawn on the surface of a sphere with radius 2 , as shown, creating a close curve that divides the surface into two congruent regions. The length of the curve is $\pi \sqrt{n}\}$. What is $n$ ?
Each of 2023 balls is placed in on of 3 bins. Which of the following is closest to the probability that each of the bins will contain an odd number of balls?
How many distinct values of $x$ satisfy $$ [x]^{2}-3 x+2=0 $$ where $\lfloor x\rfloor$ denotes the largest integer less than or equal to $x$ ?
An arithmetic sequence has $n \geq 3$ terms, initial term $a$ and common difference $d>$ 1. Carl wrote down all the terms in this sequence correctly except for one term which was off by 1 . The sum of the terms was 222 . What was $a+d+n$ ?
What is the perimeter of the boundary of the region consisting of all points which can be expressed as $(2 u-3 w, v+4 w)$ with $0 \leq u \leq 1,0 \leq v \leq 1$, and $0 \leq w \leq$ 1?
A regular pentagon with area $\sqrt{5}+1$ is printed on paper and cut out. The five vertices of the pentagon are folded into the center of the pentagon, creating a smaller pentagon. What is the area of the new pentagon?
In 2025, 8 students from Cheenta Academy cracked the prestigious Regional Math Olympiad. In this post, we will share some of their success stories and learning strategies. The Regional Mathematics Olympiad (RMO) and the Indian National Mathematics Olympiad (INMO) are two most important mathematics contests in India.These two contests are for the students who are […]
Cheenta Academy proudly celebrates the success of 27 current and former students who qualified for the Indian Olympiad Qualifier in Mathematics (IOQM) 2025, advancing to the next stage — RMO. This accomplishment highlights their perseverance and Cheenta’s ongoing mission to nurture mathematical excellence and research-oriented learning.
Cheenta students shine at the Purple Comet Math Meet 2025 organized by Titu Andreescu and Jonathan Kanewith top national and global ranks.
Celebrate the success of Cheenta students in the Stanford Math Tournament. The Unified Vectors team achieved Top 20 in the Team Round.