According to the analysis, the quantity of fruit in your question should be wrong, please correct it before you do it. ...
3. The amount of grass at the beginning of the grassland is regarded as 1, and the speed of planting grass every day is x, so the amount of grass eaten by the whole herd every day is (1+6X)/6.
The amount of grass eaten by 2/3 18 longicorn = (1+6x)/6 *18 * 2/3 =1+/8x, and the solution is X= 1/6.
Let's assume that it takes y days to finish the third lawn after all the cows (that is, the whole herd) eat it together, then
1+( 18+Y)/6 = 1/3 * 1/3 * 18+ 1/3 * Y
The solution is Y= 12, so it takes 18+ 12=30 days to complete the third plot.
4.a ran three times in 30 minutes, more than AB 1800 meters, and B just ran three times in 30 minutes, so they met three times. When they met for the first time, they ran the whole distance across the street, with time =2400/(240+300)=40/9 (minutes) and distance B = 2400. When they met for the second time, they ran back for the second time. They ran 2400*3m, the time =2400*3/(240+300)=40/3 minutes, and the distance b = 240 * 40/3-2400 = 800m. When they met for the third time, they ran back for the third time. They ran 2400 * 5 meters, the time = 2400 * 5/(240+300)= 200/9 minutes, and the distance B = 240 * 200/9-2400 * 2 = 65438+.
5. Suppose that red, yellow, blue and green represent four different natural numbers, and red
A= red+yellow =92 (1)
B= red+blue = 125 (2)
E= yellow+green = 158 (3)
F= blue+green = 19 1 (4)
C= red+green = 133 or 147 (5)
D= yellow+blue = 147 or 133 (6)
Red+yellow+blue+green =( 1)+(4)=(2)+(3)=283.
(5)+(6) is not equal to 283, so (5) or (6) is wrong. If D is right, C is wrong. C= red+green =283- 147= 136 (7)
(3)-( 1)= green-red = 158-92=66 (8)
2* Red =(7)-(8)= 136-66=70
Red =35, and the smallest number =35.
These questions are not easy for 12 and 3-year-old students ... but difficult for you.