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Fourth grade math contest and answer
In 20 12, a county in our city prepared for the 20th anniversary celebration, and the garden department decided to use the existing 3490 pots of A-shaped flowers and 2950 pots of B-shaped flowers to put them in the garden.

On both sides of Bin Avenue, it is known that 80 pots of A flowers, 40 pots of B flowers, 50 pots of A flowers and 90 pots of B flowers are needed to match a style.

(1) The extracurricular activity group of Class 9 (1) in a school undertook the design of this gardening modeling collocation scheme. How many matching schemes are there? Please help design it.

(2) If the cost of matching a model is 800 yuan and the cost of matching a model is 960 yuan, please explain which scheme in (1) has the lowest cost? How much is the minimum?

answer

(1) Three collocation schemes can be designed. (2) Scheme ③ 42,720 yuan.

The distance from Xiaoming's home to school is 2,400 meters. If Xiaoming leaves home at 7: 00 a.m. and arrives at school at 7:30-40:00 a.m., if the walking speed is m/min, he can list inequalities.

The group is _ _ _ _ _ _ _ _ _ _ _ _, and Xiaoming's walking speed range is _ _ _ _ _ _ _.

The answer is 60m/min ~ 80m/min.