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On Sunday, Teacher Zhang was carrying a basket (

The basket weighs 0.5 kg) and goes to the market to buy 10 kg of eggs. Teacher Zhang picked up the weighed eggs in the basket and felt that the quantity was much less than when she bought 10.55 kg of eggs in the past, so she put the eggs in the basket and asked the stall owner to weigh10.55 kg together. She immediately asked the stall owner to replenish some unweighted eggs. Please calculate how many Jin of eggs should be added to the stall owner's scale?

Analysis: the basket in this question weighs 0.5 kg, and the 10 kg egg to be bought should be accurate. Teacher Zhang thinks that the number of eggs weighed now is much less than when she bought 10 kg of eggs in the past, so she put the eggs in a basket and asked the stall owner to weigh 10.55 kg together (it should have been 10.5 kg), indicating that the stall owner's scale is not accurate. 0.5 kg is called 0.55 kg with the scale of the stall owner, which is well solved with the knowledge of proportion.

solve

Put a stall owner's scale and say that you want to pack X Jin of eggs, then

0.5/0.55= 10/( 10+X)

simplify

0.5X=0.5. Solve

X= 1。

Answer: According to the scale of the stall owner, eggs should be supplemented by 1 kg.

Xiao Ming spent 10 yuan buying a box of biscuits and a bag of milk. The clerk told Xiaoming that 10 yuan had extra money to buy a box of biscuits, but it was not enough to buy another bag of milk. However, today is Children's Day, so I'll give you a 10% discount to buy cookies. You can buy a box of biscuits and a bag of milk and ask you 0.8 yuan.

Seek; What is the price tag of a box of biscuits and a bag of milk?

Cookies set x yuan, milk y yuan.

And both are greater than 0.

List the equations according to the meaning of the question.

0.9X+Y= 10-0.8

( 1)

x+Y & gt； 10

(2)

X & lt 10

(3)

Y & lt 10

(4)