Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Adding and Subtracting Rational Expression - Problem 5

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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A common type of word problem in math is called a "work" word problem, where you're asked to find the total time it takes for two individuals to finish a job together, or perhaps if you know the time together, then how long it would take one individual. One way to set up a rational equation to solve this is to write the part person 1 can do in one hour times total time, plus the part person 2 can do in one hour times the total time, and set it equal to one. You'll need to find a common denominator and simplify the left side, but you can use this set up to solve for any variable in this scenario.

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