Artchicky
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.
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saifoo.khan
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\[\frac 1x =\frac{1}{10}+\frac{1}{11}\]
saifoo.khan
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1/10 = Mike's part.
1/11 = Maria'a part.
1/x = time it will take if both will work.
Artchicky
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Alright and so then i would find the common denominator and then solve for the x?
hba
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Now take the lcm,cross multiply and get to x.
saifoo.khan
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Yes.
Artchicky
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I got 120/110. do i divide 110 by 120 and turn it into a decimal?
saifoo.khan
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Nope/
Artchicky
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-.- okay so for my lcd i did 11 by 10. then okay i messed up my adding. it should be 21/110
saifoo.khan
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1/x = 21/110
Artchicky
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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
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x is in the denominator currently. Do something to bring it to the numerator.
Artchicky
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multiply the 110 to the top and bottom. I would get 110 over 110x?
hba
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See this,
\[\frac{ 1 }{ a }=\frac{ 11 }{ 10 }\]
\[a=\frac{ 10 }{ 11 }\]
saifoo.khan
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|dw:1358612774385:dw|
Artchicky
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okay now i understand
hba
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\[\frac{ 1 }{ x }= \frac{21}{110}\]
\[\ x=..\]
Artchicky
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5.23?
saifoo.khan
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Yes.
saifoo.khan
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Lol. I'm speechless.