Answer:
To clean 20 identical rooms 5 people will take 1 hour .
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49% of 598 = 598*49/100 = 293.02
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Answer: bag 1 40%
bag 2 25%
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Step-by-step explanation:
Let's expand first:

Simplify (combine like terms):


So, your most simplified answer is
18z(z-1) or
18z²-18z.