The sand pit of Chaoyang primary school is 2.5m long, 1.5m wide and 6dm deep. How many tons of fine sand are needed to fill the sand pit, which weighs 1.5 tons per cubic meter?

The sand pit of Chaoyang primary school is 2.5m long, 1.5m wide and 6dm deep. How many tons of fine sand are needed to fill the sand pit, which weighs 1.5 tons per cubic meter?

Because 6dm = 0.6m, the volume is 2.5 * 1.5 * 0.6 = 2.25 (M3)
2.25 * 1.5 = 3.375 (T)

The construction team has 80 tons of sand, ready to be transported to the construction site. Both DA Zhang and Xiao Li want to undertake the transportation task, and their speed is almost the same. Da Zhang said: "my car can transport 6 tons each time, and transport 100 yuan each time. If you transport all of them to me, the freight will be 10% off." Xiao Li said: "my car can transport 4 tons each time, and transport 70 yuan each time. If you transport all of them to me, the freight will be 20% off." (1) if you are a construction team, you can transport all of them Construction team leader, let you choose a person to transport, who would you choose? How much is the total freight at least? (2) If time is tight, how many times can we finish the joint transportation by two people? How much is the total freight?

(1) Zhang: 100 × (80 ／ 6) × 90% = 100 × 12 = 1200 (yuan) Xiao Li: 70 × (80 ／ 4) × 80% = 1400 × 0.8 = 1120 (yuan) because, 1200 ＞ 1120, so choose Xiao Li, the freight is 1120 yuan. Answer: choose Xiao Li, the freight is 1120 yuan. (2) 80 ／ (6 + 4) = 8 (Times) (100 + 70) × 8 = 170 × 8 = 1360 (yuan) answer: by two people, 8 times can be completed? The total freight is 1360 yuan

On the construction site of guangmingyuan community, four trucks are used to transport 80 tons of sand every day. (1) which two quantities are related to each other? (2) what is the proportion between the number of trucks and the tons of sand transported every day? Why?
(3) According to this calculation, how many tons of sand are transported by six such trucks every day?
(4) How many tons of sand are transported by two trucks? How many tons of sand are transported by four trucks? How many tons of sand are transported by six trucks? How many tons of sand are transported by eight trucks?

(1) (2) the number of trucks is in direct proportion to the ton of sand transported every day, because the more trucks, the more sand transported every day. (3) 6 × (80 △ 4) = 120 tons. (4) because one truck transported 80 △ 4 = 20 tons of sand, two trucks transported 2 × 20 = 40 tons of sand, and four trucks transported 4 × 20 =

The construction site uses a truck to transport 60 tons of sand, 4.6 tons each time. How many times has 14 tons left?

After x times of operation
60-4.6x=14
The solution is x = 10
Second method:
A total of 60-14 = 46
46÷4.6=10