Painters

The first team of painters would paint the bridge in 15 days, the second in 10 days. After three days of working together, the second team goes out and continues only with the first team. How many days took the second team to finish painting the bridge?

Correct answer:

x =  7.5 d

Step-by-step explanation:

(151+101) 3+151x=1  (1/15+1/10) 3+1/15 x=1  2x=15  x=215=7.5  x=215=7.5=7.5 d



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