Aunt Wang bought 400 grams of Cordyceps sinensis and put it in a small bag. If each packet is 30 grams. How many small bags should I prepare at least? (Numbers are reserved as integers)

3. Shimonoseki Kindergarten bought 380 meters of cloth as children's garden clothes. Children's Park takes cloth1.2m each. How many sets can you make at most? (Numbers are reserved as integers)

4. A worker makes 1 5 parts in1hour, and the same worker makes 4.5 hours * * * How many parts are there?

5. A car goes from A to B at a speed of 45 kilometers per hour and arrives in 2.4 hours. I traveled for 2.5 hours when I came back. How many kilometers per hour do I drive on average?

6. The grain store sent 50 bags of rice and 40 bags of flour, each containing 25 kilograms of rice and 20 kilograms of flour. How many kilograms is rice more than flour?

7. Laying underground cables on Zhongyuan Road, 34 meters have been laid, leaving 250 meters unpaved. How long is this cable?

8. Repair a section of road. The full length 1/4 was repaired on the first day, and 90 meters was repaired on the second day. At this time,150m is left unattended. How long is this road?

9. There is a pile of yellow sand on the construction site, and 23 pieces were used, which is exactly 60 tons. How many tons is this pile of yellow sand?

4. Sound travels in the air for about 3 seconds 1 km, and the speed of light is about 300,000 km per second. What is the speed of sound?

10. A wheat experimental field, originally planned to produce 8 tons of wheat per hectare, actually produced several tons of wheat per hectare?

1 1. The staff canteen planned to burn 5 tons of coal in April, but actually burned 4.8 tons. What percentage was saved?