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https://www.randomwok.com/gmat/how-to-solve-gmat-worker-rate-problems/
Jun 13, 2010 · We want to know how many hours it will take to finish painting a single house. Using our combined rate, mathematically that would be: ( 8/15 house per hour) x (number of hours) = 1 house. To get to the “number of hours” variable, we simply divide “1 house” by the combined hourly rate: 8/15. This gives us a final answer of 15/8 or 1 and 7/8. Be weary of variations the GMAT may try to throw at you.
https://www.purplemath.com/modules/workprob4.htm
Ben can wash 500 dishes in 2 hours, so, by dividing, I find that he can do 250 dishes per hour. Similarly, Frank can wash 450 dishes in 3 hours, so he can do 150 dishes per hour. Working together, they can do 250 + 150 = 400 dishes an hour. That is:
https://www.toppr.com/ask/question/thomas-can-paint-the-house-in-6-days-while-it-takes-joe-12-days-to/
If Thomas can paint the house in 6 days then in 1 day, he can paint 6 1 of the house. If Joe can paint the house in 1 2 days, then in 1 day he can paint 1 2 1 of the house. Let x is the number of days it would take them together to paint the house, then working together, in 1 day they can paint x 1 of the house.
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