The creek

Workers cleaned the creek within 3 days. The first day cleanse one-fifth the length of the creek, the next day 40% of the length of the stream and the third day 8 km length of the creek. How long is a creek?

Correct result:

x =  20 km


x/5+0.40x+8 = x

x/5+0.40•x+8 = x

2x = 40

x = 20

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