【小４の中学受験算数】 平均の問題４つ

I'm working through four middle school entrance exam math problems for fourth graders, created with Gemini. 0:00 (Question 1) There have been five quizzes so far, and the average score was 65 points. What score does a student need on the next (6th) test to bring the average score for all six quizzes to 70 points? 1:00 (Question 2) Yuta's test results were: Math 75 points, Japanese 52 points, Science 84 points, Social Studies 65 points. What is his total score for the four subjects? What is his average score for the four subjects? 2:17 (Question 3) Haruto, Sakura, and Riku went bowling together, and their average score was 82 points. Haruto scored 74 points, Sakura scored 91 points, what was Riku's score? 3:29 (Question 4) Kenta's height is 148cm, Shota's height is 132cm, and Misaki's height is 125cm. What is the average height of the three of them?