GMAT Word Problems Guide Ch 1: Word Problem Strategies Ch 2: 5-Step Method Ch 3: Functions & Symbols Ch 4: Progressions & Sequences Ch 5: Percentages Ch 6: Interest Ch 7: Ratio & Proportion Ch 8: Uniform Motion Ch 9: Work & Rate Ch 10: Grouping & Counting Ch 11: Data Interpretation Ch 12: Averages & Median
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The amount of work, W, accomplished in time, T, depends on the rate, R, at which the work is being accomplished. Work problems are quite similar to the problems of uniform motion. The equation we use is

W = RT

Try to solve the question by determining the rate per time period (usually per hour or per minute). The rate, R, is most often expressed as the job to do divided by the time, where W usually equals one completed job.

 Examples of Work Questions A tractor plows 1/10 of a field each hour; the job is one field, so the rate is 1/10 of a field per hour. If it takes x tractors to do one job in 1 hour, then each tractor works at a rate of 1/x of the job per hour. If it takes x tractors 4 hours to do one job, then each tractor works at one quarter of the previous rate, or at the rate of 1/4x of the job per hour. In general, if it takes x tractors y hours to do one job, the rate that each tractor works is 1/(x × y) of the job per hour.

 Example 1

It takes 3 men 8 hours to paint a house. How long will it take 5 men to paint the same house?

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Chapter 1: Word Problems & Strategies
Chapter 2: 5-Step Method
Chapter 3: Functions & Symbols
Chapter 4: Progressions & Sequences
Chapter 5: Percentages
Chapter 6: Interest, Discount & Markups
Chapter 7:
Ratio & Proportion
Chapter 8: Uniform Motion
Chapter 9: Work & Rate
Chapter 10:
Grouping & Counting
Chapter 11: Data Interpretation
Chapter 12: Averages & Mean