Waste less time on Facebook — follow Brilliant.
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Reasoning Skills
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
At Memorial Park, there are 3 times as many children as there are dogs. If \(A\) is the number of children and \(B\) is the number of dogs, which of the following are possible values for \(A\) and \(B?\)
(A) \(\ \ A =30, B = 3\)
(B) \(\ \ A=30, B = 10\)
(C) \(\ \ A =10, B = 30\)
(D) \(\ \ A =10, B = 3\)
(E) \(\ \ A =3, B = 10\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
If \( 6x - 18 = 0,\) which of the following is the value of \(x?\)
(A) \(\ \ 2\)
(B) \(\ \ 3\)
(C) \(\ \ 4\)
(D) \(\ \ 5\)
(E) \(\ \ 6\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
If the sum of two numbers is \(15\) and the difference of the two numbers is \(9,\) what are the two numbers?
(A) \(\ \ 11\) and \(4\)
(B) \(\ \ 11\) and \(5\)
(C) \(\ \ 12\) and \(3\)
(D) \(\ \ 13\) and \(2\)
(E) \(\ \ 13\) and \(4\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Which of the following is the smallest?
(A) \(\ \ \frac{1}{5} \div \frac{1}{8}\)
(B) \(\ \ \frac{1}{8} \div \frac{1}{5} \div 8\)
(C) \(\ \ \frac{1}{\frac{1}{5 \div 8}}\)
(D) \(\ \ 8 \div \frac{1}{5}\)
(E) \(\ \ \frac{1}{\frac{1}{5} \div \frac{1}{8}}\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
If the sum of the consecutive odd integers from \(x\) to \(3\) (both inclusive) is \(-21,\) which of the following is the value of \(x\)?
(A) \(\ \ -3\)
(B) \(\ \ -5\)
(C) \(\ \ -7\)
(D) \(\ \ -9\)
(E) \(\ \ -11\)