AoPSWiki

Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.

Personal tools

Search

Toolbox

Variable/Problems

From AoPSWiki

Contents

1 Preintroductory
- 1.1 P1
  - 1.1.1 Problem
  - 1.1.2 Solution
2 Introductory
3 Intermediate
4 Olympiad

Preintroductory

P1

Problem

What number, when added to $7$ , gives a sum of $10$ ?

Solution

We set up the equation: $x+7=10\Rightarrow x+7-7=10-7\Rightarrow x=\boxed{3}$

Introductory

Intermediate

Olympiad

Retrieved from "http://www.artofproblemsolving.com/Wiki/index.php/Variable/Problems"

Want to learn how to tackle those tough AMC/AIME/Olympiad counting and probability problems? Check out Art of Problem Solving's Intermediate Counting & Probability by David Patrick.

© Copyright 2008 AoPS Incorporated. All Rights Reserved. • Foundation • Privacy • Contact Us