Answer:
Jorge's lunch cost $19. He left a 22% tip.
2 answers:
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To solve this, set up a proportion with X being our unknown. If she cleans 12 houses in 10 hours, she cleans 27 houses in X hours. It will look like 
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Now cross-multiply to get 12x = 27(10) or 12x = 270. Divide by 12 on both sides to isolate x, X = 22.5.
It will take Kathy 22.5 hours to clean 27 houses. Must be some pretty small houses.
Now cross-multiply to get 12x = 27(10) or 12x = 270. Divide by 12 on both sides to isolate x, X = 22.5.
It will take Kathy 22.5 hours to clean 27 houses. Must be some pretty small houses.