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freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-222-sphere-packing.md
Oliver Eyton-Williams ee1e8abd87 feat(curriculum): restore seed + solution to Chinese (#40683)
* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
2021-01-12 19:31:00 -07:00

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Markdown

---
id: 5900f44b1000cf542c50ff5d
title: 'Problem 222: Sphere Packing'
challengeType: 5
forumTopicId: 301865
dashedName: problem-222-sphere-packing
---
# --description--
What is the length of the shortest pipe, of internal radius 50mm, that can fully contain 21 balls of radii 30mm, 31mm, ..., 50mm?
Give your answer in micrometres (10-6 m) rounded to the nearest integer.
# --hints--
`euler222()` should return 1590933.
```js
assert.strictEqual(euler222(), 1590933);
```
# --seed--
## --seed-contents--
```js
function euler222() {
return true;
}
euler222();
```
# --solutions--
```js
// solution required
```