Percentages: Level 2 Challenges Practice Problems Online

In a box of mangoes, 80% of them are high-quality while 20% are low-quality. If 10 low-quality mangoes are removed, then 96% of the rest will be high-quality.

What is the total number of mangoes from the start?

$\LARGE\color{#20A900}{\sqrt{100\%}=\ ?}$

There are 100 people in a room, exactly 99% are physicist. How many physicist must leave the room to bring down the percentage of physicist to exactly 98%?

If $x=80\%$ , then by what percent is $x$ larger than $x^2$ ?

There are 40 students in the classroom.

50% of students wear both glasses and sweaters.
Among the students who don't wear glasses, 75% of them wear sweaters.

If two students wearing both glasses and sweaters leave the classroom, then which of the following is a possiblity for the percentage of students who wear neither glasses nor sweaters?

Intro

Concept Quizzes

Challenge Quizzes

Percentages: Level 2 Challenges

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, interactive explorations.

Used and loved by over 7 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.