The first question. . . Is it a topic? . . Exactly 240÷ 10=24 hectares. They are all sophomores, but they are wasted. There are still 24 hectares with nothing. . .

The second question 40÷ 100x95=38 (Dao) (38-1) ÷ (40 ÷100) = 92.5%.

The third question is 2.1÷100× 64× 2 = 2.688 (ten thousand tons) 2.688-2. 1=0.588 (ten thousand tons).

Question 4: You typed two words wrong here. You make two places into a quantity of 36+x, which is the sum of the speeds of two cars, and (3+x)×6, which is the distance between the two places. 6×(36+x) and A have an equal relationship, and the last answer is infinite cyclic decimal, so it can't be done. Either the person asking the question has a problem or you have the wrong number. There's nothing I can do.

Solution 5: 5/4= 1.25 If the speed of car A is x km/h, the speed of car B is (1.25x) km/h.

5x+5( 1.25x)=585

5x+6.25x=585，

1 1.25x=585，

X=52 52 is the speed of car A, and the speed of car B is1.25x52 = 65km/h.

I can't work out the fourth question, but I have done all the other questions. Give it to me (I am a fifth-grade math expert)