2. It takes 7 minutes. Make a birthday cake with 5 grams of cream and 250 grams of flour. One day, the bakery used 90 grams of cream. According to this calculation, how many kilograms of flour was used? ?
There are 200 literary books in the school library, which is just 2.5 times the number of science and technology, and story books are 8 times that of literary books. How many are these three books? ?
4. A car travels 60 kilometers in 0.75 hours, and travels at this speed for another 4.5 hours. How many kilometers did you walk before and after? ?
5. String some beads according to 2 red, 3 white and 6 black to make a string of 200 beads. What color is the last bead? How many red, white and black beads are there?
6. Two poplars and three camphor trees were planted on one side of the road, and a total of 90 camphor trees were planted. How many poplars have been planted? What if a * * * planted 88 camphor trees?
7. How many different ways can you form a rectangle with a length and width of 30 meters? What is the largest area in square meters? ?
8. There is a math, Chinese, English and moral book in the schoolbag. Take out one or several books at will. A * * * How many different results are there? ?
9. Thirty-four students are playing table tennis singles and doubles, just using 12 table tennis tables. Can you figure out how many tables there are in table tennis singles and doubles? ?
10, the radio and TV station is the platform shared by 1 bus and No.2 bus. 1 bus stops at the platform every 12 minutes and No.2 bus stops at the platform every 15 minutes. At 7: 20 in the morning, two buses stopped at the same time. When is the next stop at the same time? ?
1 1. The school organized 348 students to go for a spring outing and prepared to rent 48-seat and 36-seat cars. How can I rent a car without a room? ?
12. laying underground cables on Zhongyuan road, 34 meters have been laid, and 250 meters have not been laid. How long is this cable? ?
13. Repair a section of road. On the first day, the whole length 1/4 was repaired, and on the second day, it was 90 meters. At this time, there is still150m left. How long is this road? ?
14. Sound travels in the air about 1 km for 3 seconds. The speed of light is about 300,000 kilometers per second. What is the speed of sound? ?
15, a wheat experimental field, originally planned to produce 8 tons of wheat per hectare, how much wheat did it actually produce per hectare?