Large and small trucks are used to transport vegetables to the urban area. The large trucks transport 6 tons each time and the small trucks transport 4 tons each time?

Large and small trucks are used to transport vegetables to the urban area. The large trucks transport 6 tons each time and the small trucks transport 4 tons each time?

Let the big one win x times and the small one win y times, then
X+Y=10,6X=4Y
X=4,Y=6

In a warehouse, a batch of 36 tons of goods are transported by trucks and vans. It is known that the number of tons transported by trucks is 1.4 times that of vans. How many tons are transported by trucks?

Design: small trucks transport x tons each time, and large trucks transport 1.4x tons each time
According to the meaning of the title, the equation x + 1.4x = 36 is obtained
Solve the equation x = 15 tons
Small trucks transport 15 tons each time, large trucks transport 21 tons each time
It can also be calculated by arithmetic. If the goods transported by the small car are regarded as unit 1, then the goods transported by the big car are 1.4
Pickup truck: 36 / (1 + 1.4) = 15 tons
Truck: 36-15 = 21 tons

17 trucks, a total of 420 goods, each of which weighs 120 kg. Large trucks can carry 4 tons and small trucks can carry 2.5 tons. How many trucks can be used

There are x large trucks and (17-x) small trucks
　　　4x＋2．5（17－x）＝50．4
　　　　　42．5＋1．5x　＝50．4
　　　　　　　　　　　1．5x＝7．9
X = 5.26 (6 cycles)
Therefore, the application of 6 large trucks, 11 small trucks

There are two trucks, big and small. Small trucks don't transport at goods every day. Big trucks force small trucks to transport 8 tons more every day. Now let big trucks transport 120 tons of goods, small trucks
Which vehicle takes less time to complete the task of 100 tons of goods?

Because (1) when 20a-800 ＞ 0, i.e. a ＞ 40, the time for small trucks is less; (2) when 20a-800 = 0, i.e. a = 40, the time for two trucks is the same; (3) when 20a-8