We met at a distance of 15 km from the midpoint. How many kilometers did the train travel at this time?
Solution:15× 2÷ (7/11-4/1)× 7/1= 70 (km).
A: At this time, the train traveled 70 kilometers.
2. The tonnage ratio of grain stored in warehouse A and warehouse B is 7:8. If warehouse A delivers 16 tons, warehouse B also delivers 16 tons.
Then the tonnage ratio of warehouse A and warehouse B is 5:6. How many tons of grain are stored in warehouse A and warehouse B respectively?
Solution: Assume that the original warehouses A and B store 7x tons and 8x tons of grain respectively.
(7x- 16):(8x- 16)=5:6
Solution: x=8
7x=56 (ton)
8x=64 (ton)
A: It turns out that warehouse A and warehouse B have 56 tons and 64 tons of grain respectively.
The sixth grade students are divided into three groups to plant trees. The ratio of the first group to the second group is 5: 4, and the ratio of the second group to the third group is 2:3.
It is known that the first group has 30 fewer people than the two or three groups combined. How many people took part in planting trees in the sixth grade?
Solution: The number of people in the first group and the second group is 5: 4.
The number of people in the second and third groups is 2: 3 = 4: 6.
The ratio of people in the first, second and third groups is 5: 4: 6.
There are 5x, 4x and 6x people in the first, second and third groups respectively.
5x+30=4x+6x
Solution: x=6
5x+4x+6x= 15x=90 (person)
A: There are 90 people who participated in tree planting in the sixth grade.
4. Party A, Party B and Party C deposited 2980 yuan, with Party A withdrawing 380 yuan, Party B withdrawing 700 yuan and Party C withdrawing its own 1/3.
At this time, the deposit ratio of the three people is 5:3:2. How much is A's deposit now?
Solution: The deposits of Party A, Party B and Party C are 5x, 3x and 2x respectively.
(5x+380)+(3x-700)+2x \u( 1- 1/3)= 2980
Solution: x=300
5x= 1500
A: At present, A's deposit is 1500 yuan.