Math application problems in the second day of junior high school - Training Enrollment Network

Math application problems in the second day of junior high school

1, construction team A lays X meters every day, and construction team B lays x-20.

350/x=250/(x-20)

x=70 70-20=50

So a is 70m/ day and b is 50m/ day.

2. Single armour construction: 4200/70*3000= 180000 yuan.

Single B construction: 4200/50*2500=2 10000 yuan.

Construction together: 4200/(70+50) * (3000+2000) =175000 yuan.

So it is reasonable to contract two teams to work together.

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