I can t understood your percents :/

$\begin{array}{rcll} 4 \text{ people} \cdot 2.5\ h &=& \frac12\ \text{job} \quad & | \quad \cdot 2 \\ 10\text { people} \cdot x &=& \frac13\ \text{job} \quad & | \quad \cdot 3 \\ \end{array}\\ $

$2\cdot 4 \cdot 2.5 = 1 job = 3\cdot 10 \cdot x\\ x = \frac{2\cdot 4 \cdot 2.5}{3\cdot 10}\ h\\ x = \frac{20}{30} \ h\\ x = \frac23\ h \\ x = 40\ \text{minutes}$​

i pastet the same photo excuse me heureka !

Hallo Solveit, so you can make it:

thank you Omi67 and heureka !

Solveit,

You asked exactly the same question before.

And you were involved in the answers.

I do not understand why you asked again.

I am really puzzled by this.

http://web2.0calc.com/questions/hmm_1

i accidentally paste the same photo it was a percent question: "I can t understood your percents :/"

I like to look it as how many  people-minutes/job      (people minutes per job)

( 4 people   x   150 minutes )  /  (1/2 job)  =  1200  people-minutes/job

for the second job:    ( 10 people x  ?minutes)/ (1/3job)  = 1200 people-minutes/job

                                                then   ?  = 40 minutes

Hi Solveit,

I do not understand, couldn't you delete the picture when you realized it was the wrong one?

I am not upset with you, I a m just trying to ascertain if there is something about the site that I don't understand.

I was only just told last night that normal members cannot edit their posts for very long after they are  posted.

I didn't know that......

Oh, I see,  that is what you were trying to tell us in your first answer post.  Ok