1. There are two barrels of oil, and the weight of barrel A is five times that of barrel B. If 24 kilograms of barrel A is poured into barrel B, the two barrels of oil are equally heavy. How many kilograms do these two barrels of oil weigh?

Assume that the crude oil in barrel B is x grams, and the crude oil in barrel A is not 5X grams.

5X-24=X+24 X= 12

Barrel A: 5× 12=60

2. For a three-digit number, the number in the tenth digit is twice that in the hundredth digit, the number in the single digit is 4 larger than that in the hundredth digit, and the sum of the numbers in the three digits is 12. What is this three-digit number?

3. Chickens and rabbits live in the same cage. Chickens have 26 more feet than rabbits. How many chickens and rabbits are there?

There are 26 more chickens than rabbits. -Rabbits =26.

* * * 274 chickens with feet +4 rabbits =274.

Chicken =63 Rabbit =37

Xiaoming and his friends went to the toy store and bought 16 goldfish kites (each 4.6 yuan) and swallow kites (each 3.5 yuan). When checking out, the assistant aunt mistakenly counted the goldfish kite as a swallow kite and the swallow kite as a goldfish kite. As a result, Xiao Ming charged them 73.4 yuan. Is the store losing money or Xiaoming losing money?

Numbers can be used not only for (quantity) and (order), but also for (code).