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Junior high school mathematics (engineering problems)
The efficiencies of A, B and C are 1/20,115 and 1/25, respectively.

Party A and Party B will pour * * * within 4 minutes.

( 1/20+ 1/ 15)*4

keep

1-( 1/20+ 1/ 15)*4

Filling teeth takes time.

[ 1-( 1/20+ 1/ 15) * 4]/( 1/ 15- 1/25) = [ 1-]

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