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Application problem-engineering problem primary school mathematics
Solution: The working efficiency of Party A and Party B in two days is (110+112) × 2 =11/30.

The working efficiency of Party C and Party D in two days is1-11/30 =19/30.

This batch of clothes * * * has144 ÷ (19/30-1/30) = 540 (pieces).

A: There are 540 pieces of clothes in this batch.

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