The first team of painters would paint bridge in 15 days, the second in 10 days. After 3 days of working together second team goes out and continue only first team. How many days took second team to finish painting the bridge?

Correct result:

x =  7.5 d


 (1/15+1/10) 3+1/15x=1  (1/15+1/10) 3+1/15 x=1  2x=15  x=152=7.5=152 d=7.5 d

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