## 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.

## Comments

Sort by:

TopNewest30.7 – Rakib Hasan · 3 years ago

Log in to reply

12+20=30 & 20+50=70 & last 3 digit is 0 Hence ans is 30.50000. – Shrey Shah · 2 years, 8 months ago

Log in to reply

30.7 – Daksh Padshala · 2 years, 12 months ago

Log in to reply

7 – NaVeen Navi · 2 years, 12 months ago

Log in to reply