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Repair a water-together, have been through a full 90% of the remaining 50 meters there is no repair,

QQ9612972102010-02-18 18:10:33 +0000 #1
Fast
blind from a broken, right2010-02-18 18:27:07 +0000 #2
50 divided by the number (1-90 %) = 500 m

This ditch 500 meters long
4796173392010-02-18 18:49:30 +0000 #3
50 ÷ (1-90%)

= 50 ÷ 0.1

= 500 (m)

A: The length of this ditch 500 meters

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