True of false low BAL will always cause a hangover?

If a group of pupils found that if one of them scores 9 marks more in their maths test her average score is 81 but if one of them scores 3 marks less the average score is 78 how many pupils are there? Is 166 prime? What does the word power mean in mathematics? How do you use 6 times 6 equal to 144? How do you write the number 5million million million million? What is 1.3 km in meters? What is the greatest possible error of 20 cm? A cake is divided into four pieces. How do you make it into eight equal parts with just one cut? Is yes an adverb? What is the definition of multiplacation inverse? How many kilometers is one thousand millimeters? How many feet in 1.234 miles? What is 40 degrees in a triangle? What is the shortest chapter in the Bible? What is the remainder for 867 divided by 9? How many 7 yds in ft? What is 1800-552? How do you find the slope intercept of a vertical line? What are vertices of solid figures? How many meters in 1.5 km?