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Given the equation 15 + x = 2 (6 + x), try to write an application problem, list the given equation and solve the equation
Xiao Hong has six more apples than Xiao Ming. If you give Xiao Ming another 15 apples, his number will be twice that of Xiao Hong. How many apples did Xiao Ming have?
Suppose Xiao Ming had x apples
15+x=2(6+x)
15+X=12+2X
X=3
A: Xiaoming used to have three apples
"Equation" is a very important mathematical model in real life. Please make up an application problem of binary linear equations in combination with your real life
x=2y
2（3x+4y）=40
It's a question on the basis of seven basic training
In class 1, Grade 7, boys are twice as many as girls. They go to the amusement park. The price of roller coaster is 3 yuan for girls and 4 yuan for boys. The whole class has played twice, and the total cost is 40 yuan. How many boys and girls are there in this class?
"Three equations" is a very important mathematical model in real life. Please make up an application problem of binary linear equations based on your real life
3x-2y=16 2x+y=27
Xiao Ming wants to buy school supplies. Xiao Ming has 27 yuan in total. He can buy two notebooks and one pen, and the price of the notebook is higher than that of the pen. If he buys three notebooks, he can buy two pens, and the remaining 16 yuan. What's the price of the notebook and pen
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