anonymous
  • anonymous
It takes Maria 11 mins to weed a garden. Mike can weed the same garden in 10 minutes. How long would it take them if they work together? - I got 21 mins but i honestly don't know how to round it.
Mathematics
katieb
  • katieb
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saifoo.khan
  • saifoo.khan
\[\frac 1x =\frac{1}{10}+\frac{1}{11}\]
saifoo.khan
  • saifoo.khan
1/10 = Mike's part. 1/11 = Maria'a part. 1/x = time it will take if both will work.
anonymous
  • anonymous
Alright and so then i would find the common denominator and then solve for the x?

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hba
  • hba
Now take the lcm,cross multiply and get to x.
saifoo.khan
  • saifoo.khan
Yes.
anonymous
  • anonymous
I got 120/110. do i divide 110 by 120 and turn it into a decimal?
saifoo.khan
  • saifoo.khan
Nope/
anonymous
  • anonymous
-.- okay so for my lcd i did 11 by 10. then okay i messed up my adding. it should be 21/110
saifoo.khan
  • saifoo.khan
1/x = 21/110
anonymous
  • anonymous
then i would multiply the 1 and that would isolate the x. leaving me with the 21/110 and then i simplify it?
saifoo.khan
  • saifoo.khan
x is in the denominator currently. Do something to bring it to the numerator.
anonymous
  • anonymous
multiply the 110 to the top and bottom. I would get 110 over 110x?
hba
  • hba
See this, \[\frac{ 1 }{ a }=\frac{ 11 }{ 10 }\] \[a=\frac{ 10 }{ 11 }\]
saifoo.khan
  • saifoo.khan
|dw:1358612774385:dw|
anonymous
  • anonymous
okay now i understand
hba
  • hba
\[\frac{ 1 }{ x }= \frac{21}{110}\] \[\ x=..\]
anonymous
  • anonymous
5.23?
saifoo.khan
  • saifoo.khan
Yes.
saifoo.khan
  • saifoo.khan
Lol. I'm speechless.

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