Painters

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?

Result

x =  7.5

Solution:

3(115+110)+115x=1 x=7.53(\dfrac{1}{15}+\dfrac{1}{10})+\dfrac{1}{15}x = 1 \ \\ x = 7.5

(1/15+1/10)*3+1/15x = 1

2x = 15

x = 152 = 7.5

Calculated by our simple equation calculator.



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