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Water injection in primary school mathematics
Solution: It takes x hours to fill a single armor opening with water.

Then the filling ratio of B is: 2 divided by (1/X*2.5)=4X/5.

( 1/X+5/4X)* 4+ 1/X * 6 = 1

X= 15

4* 15/5= 12 (days)

A: It takes 15 days to prescribe once and 12 days to prescribe twice.

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