Solution: let this number be X.
8x+ 10= 10x-8
10x-8x= 10+8
x= 18÷2
x=9
2. The average of two numbers is 24.6, in which the number A is twice that of the number B. What is the number B?
Solution: let b be x, then a is 2x.
x+2x=24.6×2
x = 49.2 \3
x= 16.4
3. Mom bought three bags of milk, 1 bottle of drinks, and spent 10.35 yuan. The price of a bottle of beverage is 0.5 times that of 65438+ a bag of milk. What are the prices of drinks and milk?
Solution: If each bag of milk is X yuan, then each bag of drinks is 1.5x yuan.
3x+ 1.5x= 10.35
x= 10.35÷4.5
x=2.3
Beverage: 2.3× 1.5=3.45 yuan.