Two companies

The two companies made a work together in 100 days. The first company would do it in 150 days, how many days would the work take the second company?

Correct answer:

b =  300

Step-by-step explanation:

a=150 d c=100 d  c (a1+b1)=1  ac+bc=1  bc=1ac  b=1c/ac=1100/150100=300

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