#### Rule of three Khan Academy Talent Search 2015

Formula for solving simple rule of three problems.

# Answer

Seven readers have 84 pages how many pages will 6 readers have?

To solve that we need to use the rule of three:

7 readers--- 84 pages

6 readers--- =??? pages

By using the rule of three we multiply: 6 x 84 and we divided by 7 :

6 x 84 / 7 =

$$6\times84\div7$$

**Solution:**

$$72$$

**The numbers of pages that 6 readers will have: 72 pages.**