An engineering team works on a highway. In the first two days, it works a total of 1 km and 360 meters, and in the next three days, it works an average of 800 meters per day. How many kilometers does the engineering team work on a daily basis?

An engineering team works on a highway. In the first two days, it works a total of 1 km and 360 meters, and in the next three days, it works an average of 800 meters per day. How many kilometers does the engineering team work on a daily basis?

Average = (1360 + 3 × 800) / (2 + 3) = 752m / D = 0.752km/d

There are 20 multiple-choice questions in a test paper. 10 points will be deducted for each right choice. 5 points will be deducted for each wrong choice or not

Is that the original question?
There are 20 multiple-choice questions in the test paper. If you choose the right one, you will get 10 points. If you choose the wrong one or not, you will get 5 points. How many questions should you choose correctly? The score will be no less than 80 points
If you want to choose the right x question, the score will not be less than 80
According to the meaning of the title: 10x - (20-x) * 5 ≥ 80
X≥12
A: at least 12 questions should be selected correctly, and the score should not be less than 80

A certain individual buys a batch of leather balls at the wholesale price. The cost price is 0.15 yuan for each ball and the retail price is 0.25 yuan for each ball. When he sells only 20 leather balls, he calculates the profit of 10 yuan excluding the total cost. How many leather balls does the individual buy?

10 △ 0.25-0.15) + 20, = 10 △ 0.1 + 20, = 100 + 20, = 120 (pieces); a: this player has bought 120 balls