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Questions in Grade Middle-school

[Answered] Jerry is experimenting with chemicals in the laboratory. He mixes a solution that is 10% acid with a solution that is 30% acid. How much of the 30% acid solution will be needed to make 40 liters of a solution that is 25% acid?

[Answered] Peter is reading a 193-page book. He has read three pages more than one-fourth of the number of pages he hasn't yet read. How many pages has he not yet read? Estimate how many days it will take Peter to finish the book if he reads about 8 pages per day.

[Answered] Organizers for a high school graduation have set up chairs in two sections. They placed 126 chairs for the graduates in the front section and 588 chairs for guests in the back section. If all rows have the same number of chairs, what is the greatest number of chairs possible for a row?

[Answered] In Chemistry class, Andrew has earned scores of 64, 69, and 73 on three tests. He must maintain an average of 70 to pass the course. What score must Andrew earn on the final exam to pass the course?

[Answered] Ms. White has 15 students in her first-grade class. Troy is the line leader for the week, and Mackenzie is last because she was the line leader last week. In how many different ways can Ms. White's class line up for lunch?

[Answered] One circular table has a diameter of 9 ft, and another circular table has a diameter of 14 ft. How much greater is the area of the larger table? Round to the nearest whole number.

[Answered] Can you please tell me some words that you can make from the word 'Scotland'? - The words must be at least four letters long. - You can only use each letter once.

[Answered] The point A is on a mountain, which is 5700 m above sea level, and point B is in a mine, which is 3960 m below sea level. Find the vertical distance between A and B.

[Answered] What is 469,019 rounded to the nearest 100?

[Answered] What is the solution to the equation \(4x - 7 = 37\)? Please show it step by step.