A and B drinks with the same kind of fruits and vegetables but different concentrations, a drink weighs 40 kg and B drink weighs 60 kg. Now pour out a part from each of the two drinks, and the weight of the poured out part is the same, and then mix the poured out part of each drink with the rest of the other drink. If the fruit and vegetable concentrations of the mixed two drinks are the same, then pour out a part from each drink Out of the same weight is___ Kilogram

A and B drinks with the same kind of fruits and vegetables but different concentrations, a drink weighs 40 kg and B drink weighs 60 kg. Now pour out a part from each of the two drinks, and the weight of the poured out part is the same, and then mix the poured out part of each drink with the rest of the other drink. If the fruit and vegetable concentrations of the mixed two drinks are the same, then pour out a part from each drink Out of the same weight is___ Kilogram

Let the original concentration of a drink be a, and the original concentration of B drink be B. the same weight poured out from each drink is XKG. From the meaning of the title, we get ax + B (60-x) 60 = BX + a (40-x) 40, and simplify it to (5a-5b) x = 120a-120b, that is, (a-b) x = 24 (a-b), ∵ a ≠ B, ∩ x = 24

Xiaoqian's father borrowed a sum of money from the bank and agreed to repay it for two years. The annual interest rate of the loan was 6% (excluding compound interest). He used the money to buy a batch of goods and sell them at 37% higher than the purchase price. After two years, he sold them out and paid off the principal and interest of the loan with the income. There was 40000 yuan left. How much was Xiaoqian's father's loan two years ago?

Suppose the loan is x 10000 yuan, according to the meaning of the question: X (1 + 37%) - (1 + 2 × 6%) x = 4 solution: x = 16 answer: little money's father's loan is 160000 yuan;

Solving applied problems by solving equations of mathematical problems once in one variable
Xiao Ming went to the shoe store and bought a pair of 220 yuan sports shoes. He bought them at a 20% discount on the price. What was the original price of the shoes

Let the original price be x yuan
0.8x=220
x=220/0.8
x=275
A: the original price is 275 yuan