Question 1199624
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Let's say you have 4 painters that have completed 12 rooms in 8 hours. 
Assuming they are working at the same efficiency, how many hours does it take 
7 painters to paint 21 rooms?
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<pre>
Let the number of hours in the second scenario be h.


The rate of job of each painter in the 1st scenario is  {{{12/(4*8)}}} = {{{3/8}}}  of the room per hour.


The rate of work of each worker in the 2nd scenario is  {{{21/(7*h)}}} = {{{3/h}}}.


The rate of work is the same in both scenario, so we can write this equation

    {{{3/h}}} = {{{3/8}}}.


It implies h = 8 hours.    <U>ANSWER</U>
</pre>

Solved.


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