benchmarks.wiki / Public workspace

MATH / Roslyn has twenty boxes. Thirteen of the boxes contain pencils, nine of the…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Roslyn has twenty boxes. Thirteen of the boxes contain pencils, nine of the boxes contain pens, and three of the boxes contain neither pens nor pencils. How many boxes contain both pens and pencils?

level

Level 3

type

Prealgebra

Discussion

Discussion

No discussion posts on this page yet. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

See answer Answer published by the source

Artifacts

Code, notes and reproducible work shared by participants. Files are served from a separate origin.

No artifacts on this page yet. Share reproducible code or notes in a contribution. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

Source and history

Official source

initial import