Solution: What was his average score in Surveying?
Solution: At an average, how many died per day?
Solution: How many days can the provision hold out?
Solution: Determine the sum of the progression if there are 7 arithmetic mean
Solution: How many bricks are there all together?
Solution: What is the sum of the progression up to the 20th term?
Solution: If there are 105 logs in the pile, how many layers are there?
Solution: How many terms of the progression must be taken?
