Hayhayz
  • Hayhayz
Andrea can clean a house 4 times as fast as Denise. When they work together, Andrea and Denise can clean a large house in 8 hours. How many hours would it take Denise to clean the house by herself? Answer choices : 20, 15, 10 , 5
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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escamer
  • escamer
@malcolmmcswain
escamer
  • escamer
u know he knows this haleigh ;) XD
escamer
  • escamer
@dan815

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More answers

Hayhayz
  • Hayhayz
@dan815
anonymous
  • anonymous
Let x = Denise's time if do by herself 4x = Andrea's time if do by herself the time when they work together can be written as \[(4x * x)/(4x + x) = 8\] \[4x^2/5x = 8\] \[4x/5 = 8\] \[4x = 5 * 8\] \[4x = 40\] \[x = 10\] so, Denise's time id work by herself is 10 hours
Hayhayz
  • Hayhayz
thank youu
dan815
  • dan815
|dw:1450125116377:dw|
dan815
  • dan815
okay reverse D and A since they said Andrew cleans 4 times as Fast as Denise
Hayhayz
  • Hayhayz
okay i see that
malcolmmcswain
  • malcolmmcswain
LOL sorry im late my computer is lame :O Dan has under control? :)
dan815
  • dan815
Okay now Switching A and D like i should have in the beginning so in 8 hours they both cleaned a full house, Andrea did 4/5th of the work and Dennis did 1/5th of the work. okay so in 8 hours he did 4/5th of the work so how much longer will it takes to complete 1/5th of the remaining work if 8 hours take 4/5th 8=2+2+2+2 = 1/5 + 1/5 + 1/5 + 1/5 = 4/5 work so adding another 2 will give u another 1/5 10=2+2+2+2+2=1/5+1/5+1/5+1/5+1/5=5/5 work = work
Hayhayz
  • Hayhayz
Lol its okay mal and yea :)
dan815
  • dan815
so thats how it takes 10 hours
malcolmmcswain
  • malcolmmcswain
dan bby ur good at chess and math =]
dan815
  • dan815
oph ya malcom lets play :)
dan815
  • dan815
talk in chat
malcolmmcswain
  • malcolmmcswain
fine =| im kinda busy
Hayhayz
  • Hayhayz
AYE dan i still gots 3 more questions for u!!!
dan815
  • dan815
okay but does this make sense?
Hayhayz
  • Hayhayz
yes it does

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