Math Olympiad 5

Multiple & Factor( Week 24 Evaluation)

1. Laura bought more than 4 apples. Counting by 4s, there is one apple left. Counting by 5s, there is one apple left too. At least, how many apples did she buy?

3. If x − 6 is a multiple of 7, which of the following must be the next greater multiples of 7?

4. Alice, David, and Eric are riding a bike around a 500 yards circular track. They start at the same place, same time and in the same direction, but each rides at different speed with Alice at 790 yards per minute, David at 840 yards per minute, and Eric at 890 yards per minute. What is the least number of minutes will it take for all three to be together again?

5. A number is greater than 6. When the number is divided either by 13 or 15, the remainder is 6. What is the smallest possible even number that has the above property?

6. Tom has a certain amount of money to spend on 3 types of gifts, and their prices are $6, $7, and $8 each respectively. If he spends all the money on any single type of gifts, there will all be $5 left. The amount of money Tom has is more than $8. At least, how much (in dollars) money does Tom have?

8. 48 apples are to be divided into equal piles. There are more than 1 but less than 48 apples in each pile. At most how many ways could the apples be divided?

9. A jar contains between 270 and 370 candies. If candies are taken out from the jar 9 at a time, there will be 8 candies left. If candies are taken out from the jar 10 at a time, there will be 9 candies left. How many candies are in the jar?

10. Larry collects coins and also loves math. When asked how many coins he had collected, he said the following: "If I arrange them in stacks of 5 each, none are left over. If I arrange them in stacks of 8 each, none are left over also. However, one is left over if I arrange them in stacks of 11 each". What is the smallest number of coins Larry could have collected?