In February, the deposit ratio of Party A and Party B was 3: 4. In March, Party A deposited money in 300 yuan and Party B deposited money in 500 yuan. At this time, the deposit ratio between them is 5: 7. How much do you want to deposit in February?

Solution:

Let Party A and Party B deposit in 3 yuan and 4 yuan respectively in February,

(3X+300)/(4X+500)=5/7，X=400。

Therefore, A's deposit in February is 3x= 1200 yuan, and B's deposit in February is 4x= 1600 yuan.

A: Omit.

After pouring 1/3 from barrel A to barrel B, pouring 1/5 from barrel B to barrel A, there is 24 kilograms of oil in each barrel at this time. How many kilograms of oil are there in barrels A and B?

Solution: According to the meaning, the total amount of two barrels of oil =24*2=48 kg.

Let's assume that barrel A initially contains X kilograms of oil and barrel B contains (48-X) kilograms.

Then 2x/3+(1x/3+48-x)/5 = 24;

8X/ 15+48/5 = 24；

The solution is X=27.

48-X=48-27=2 1 Answer: The two barrels of oil originally contained 27kg and 2 1 kg respectively.