Divide 15 apples into 5 parts, each of which accounts for () of the total number of apples

The 15 apples are divided into 5 parts averagely, each of which is (3) apples

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1. One part of cement, two parts of yellow sand and three parts of stone are used to prepare a kind of concrete on the construction site. Now we need to prepare 6 tons of concrete. Is 10 bags of 50 kg cement enough?
2. 6 tons of concrete is made with 1 part of cement, 2 parts of yellow sand and 3 parts of stone on the construction site. Is 10 bags of cement of the brand as shown in the figure enough? 1 bag of 50kg To calculate the formula / step
3. There are 10 red, yellow, blue and white beads in one bag. In order to make sure that two of them have the same color, how many beads should be taken out at least?
4. As early as in the 14th century, China invented the abacus. Each bead above the abacus represents______ Each bead below represents______ ．
5. How many upper beads and how many lower beads should be used to represent the "8" on the abacus?
6. What does the abacus represent?
7. There are 20 beads of 5 different colors in the bag. To ensure that 4 beads of the same color are taken out, at least () beads should be taken out Will anyone
8. What does one bead mean on the abacus? What does the next bead mean
9. Each bead above the abacus represents ()
10. There are 161 glass balls. Red is five times as much as yellow, and yellow is as much as green. How many glass balls are there in each of the three colors?
11. There are 30 apples in a pile, which are divided into 6 parts on average. Two apples are given to other children, and the rest is left______ Of the total______ ．
12. 1: 2: divide 18 apples equally into 3 portions, each portion accounting for () of the total number, and 2 portions accounting for (). Do you find the difference between the above two questions? Please tell me
13. The 12 apples are divided into four parts, each accounting for a quarter of the total
14. Divide 6 peaches into 2 portions, each of which is half of the total number of peaches___ , each of which is___ A peach
15. Observe the following column: 1 / 2, 1 / 2, 1 / 12, Please tell me the law and the ninth number,
16. If you are good at mathematics, please come in. Question: observe the law of the following column of numbers: 1 / 2, 1 / 6, 1 / 12. What is number 2011? Observe the law of the number in the following column: 1 / 2, 1 / 6, 1 / 12. What is the number 2011 As long as I understand and set it as high quality answer Help
17. The integers smaller than - 1 are arranged as follows: (in the above numbers, observe their rules and answer which column will the number - 100 be in?) First column second column third column fourth column fifth column -2 -3 -4 -5 -9 -8 -7 -6 -10 -11 -12 -13 -17 -16 -15 -14 …… …… …… Cause cause cause cause cause cause cause cause Cause cause cause cause cause cause cause cause -8 in the second column, - 6 in the fourth column, only - 9 - 17 in the first column, only - 13 and - 15 in the fifth column, and so on
18. Arrange - 3, - 1, 1, 3, 5, 7, 9... According to the rule, then the nth number is? (n is an integer)
19. What are the rules of the number arrangement of 0 1 2 6 16 44 120?
20. Find the law 1 2 6 16 44 () 328