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The process of solving the first math problem with a linear equation of one variable.
Solution: (1) Suppose X products are produced, then X/ 16=X/24+20, and the solution is X=960.

(2) Party A alone: it takes 60 days, and the * * fee is: 60×80+60×5 = 5 100 yuan.

Single B: It takes 40 days, and the cost of * * is: 40×120+40× 5 = 5,000 yuan.

Cooperation between Party A and Party B: It takes 24 days to produce 16+24=40 pieces every day, and the cost of * * * is: 24× 80+24×120+24× 5 = 4,920 yuan.

Therefore, the cooperation between Party A and Party B saves money and time.