For a project, it takes 10 days for Party A to do it alone, and 15 days for Party B to do it alone. The work efficiency ratio of Party A and Party B is (3: 2).
(2) A food store has 8/9 tons of white sugar, 2/5 tons on the first day and 3/ 10 tons on the second day. How many tons will be brought in as much as the original sugar? (I want formulas and answers)
8/9-(8/9-2/5-3/ 10)
=8/9-(22/45-3/ 10)
=8/9- 17/90
=63/90
=7/ 10
A: ———————.
Fifth grade:
1. The fan chart shows the total with (), and each () in the circle shows the percentage of each part in the total.
2. The relationship between () and () can be clearly expressed by the fan-shaped statistical chart.
Grade 4 (1): departments A, B and C participate in track and field competitions. Before the competition, it was agreed that the first place, the second place and the third place in each competition would be given 5 points, 2 points and 1 point respectively. The person who scores the most points wins. Now I know that A won the first place in the 100-meter race. C won the championship, accumulating 22 points; A and b get 9 points each. Please judge the ranking of the three people in the competition.
Level 3: Write 3 at the left end of a 3-digit number to get a 4-digit number. Write 3 at the right end of this number to get a 4-digit number. The difference between these two four digits is 107 1. Did you find this three-digit number?
Grade two: Xiaohong and Xiaohua I have 800 lucky money. Xiaohong is three times as big as Xiaohua. How old is Kobanawa in Qian Qian?
Grade 1: I don't seem to remember!
That's all my answer. I hope you like it!