1, (180-6×15) ÷ 7.5 =12 (days)
2. The construction site needs sand 106 tons, and car transportation 15 times, with 2.4 tons each time. The rest are transported by cart, 5 tons each time. How many times will it take to complete?
2. (106-2.4×15) ÷ 5 =14 (times)
Zhang Li bought four fables and four English humors, gave them 20 yuan and took them back to 7.6 yuan. Every fable 1.6 yuan. How much is each English humor?
3. (20-7.6) ÷ 4-1.6 =1.5 (yuan)
There used to be 30 boats in People's Park, which could bring 540 yuan's income every day. Now there are more 15 boats than before. What's your daily income now?
4, 540 ÷ 30× (30+15) = 810 (yuan)
5. The TV factory originally planned to produce 1680 color TV sets in 36 days, but half of them were completed in the first 16 days. The rest of the plan will be completed within 6 days. How many units are produced on average every day?
5, 1680 ÷ 2 ÷ 6 = 140 (Taiwan Province)
1. A factory has a batch of coal. It was originally planned to burn 5 tons a day, which can last for 45 days. In fact, it burns 0.5 tons less every day. How many days can this batch of coal burn?
1, 5× 45 ÷ (5-0.5) = 50 (days)
2. The school bought150m long plastic rope, cut off 7.5m first, and made three skipping ropes with the same length. According to this calculation, how many plastic ropes are left?
2.( 150-7.5) ÷ (7.5 ÷ 3) = 57 (root)
3. To build the canal, it was originally planned to build 0.48km every day and complete it in 30 days. Actually, it's repairing 0.02 kilometers every day. How many days was it actually repaired?
3.0.48× 30 ÷ (0.48+0.02) = 28.8 (days)
4. Miss Wang reads a book. If he reads 32 pages every day, 15 days will be enough. Now I read 40 pages a day. I can finish reading them a few days in advance.
4. 15-32× 15 ÷ 40 = 3 (days)
A car traveled 260 kilometers in four hours. At this speed, it traveled for another 2.4 hours. How many kilometers have you traveled before and after? (Answer in two ways)
5, 260 ÷ 4× 2.4+260 = 4 16 (km) 260 ÷ 4× (4+2.4) = 4 16 (km)
6. Shihe Farm first sent eight harvesters to harvest late rice, and harvested 19.2 hectares two days ago. Later, it was increased to 13 harvesters, and it was cut at the same speed for four days. How many hectares of land have they cut down?
6.19.2 ÷ 2 ÷ 8× 4×13+19.2 = 81.6 (hectare)
7. The distance between Party A and Party B is 600 kilometers. A bus and a truck run from Party A to Party B at the same time. The bus arrived four hours earlier than the truck. When the bus arrived at Party B, the truck traveled 400 kilometers. How long does the bus take to complete the journey?
7,600 ÷ [(600-400) ÷ 4]-4 = 8 (hours) or 4 ÷ (600 ÷ 400- 1) = 8 (hours).
The distance between Party A and Party B is 500 kilometers. Party A travels 30 kilometers per hour and Party B travels 20 kilometers per hour. How many hours did you meet when you left at the same time?
500÷(30+20)= 10
1. This store has 2 10 color TV sets, which is 3 times more than black and white TV sets. How many black and white TV sets are there in this shop?
1.63 sets
2. Use a wire with the length of 12.4 decimeter to form an isosceles trapezoid. It is known that the two waists of this trapezoid are 6.4 decimeters long and the area is 9 square decimeters. What is the height of this trapezoid? (Equation solving)
2.3 meters
There are several geese and ducks in the river, among which the number of ducks is four times that of geese. It is also known that there are 27 geese in Abby Mallard. How many are there in each goose and duck?
There are 9 geese and 36 ducks.
4. A forest farm should plant 2000 trees, with an average of 350 trees per day in the first three days. The rest are required to be planted in two days. How many trees should be planted on average every day?
4.475 trees