Question 1132983
Unknown n number of workers in the question.


Rate of work for 1 worker, r.



{{{system(2r*7=1,n*r*70=100)}}}

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{{{r=1/14}}}
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{{{n(1/14)*70=100}}}

{{{n=100(1/70)*14}}}

{{{n=100*14/70}}}

{{{n=10*14/7}}}

{{{highlight(n=20)}}}