Analyzing structure word problems

Given some information about a real-world context, analyze expressions containing unknown variables that model that context.

Reasoning about unknown variables: divisibility

Sal solves the following challenge: Given the positive integers a, b, and c, where a is a multiple of c and (a+b)/c is an integer. Is b necessarily a multiple of c?

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# Reasoning about unknown variables

Sal solves the following challenge: Given that a>0, b<0, and a/b>a*b, what further can we learn about the variables? Created by Sal Khan.