Math Olympiad 4( Week 25 Quiz 5) 1. All the numbers are from 6 to 11 and each number is only allowed to be used once. Fill in the blanks with the remaining numbers within the range so that the sums of the three numbers in each side are the same.
3. What is the square root of 100? 4. In the product 15 × 16 × 17 × 18 × 19 × 20 × 21, which one of the seven numbers should be increased by 1 to cause the smallest increase in the product? 5. The average of a list of 4 numbers was 24. After two numbers were added to the list, the average became 25. What was the average of the two numbers that were added to the list? 6. 210 gallons of water were poured into an empty tank and filled of the tank. How many gallons does a full tank hold? 7. How much (in dollars) do 100 pieces of chocolate cost if 1000 pieces cost $100? 8. The sum of the ages of Laura and Morgan is 15, the sum of the ages of Laura and Martha is 18 and the sum of the ages of Morgan and Martha is 15. How old is Laura? 9. The average of 6 numbers is 14. Suppose 21 is added the group. What is the new average of all the numbers? 10. Martha can buy a dozen candy bars for 72 cents. If she spends $7.2 on the candy bars and sells them for a total of $13.2, how much will she charge (in cents) for each candy bar? 11. What is the greatest common factor (GCF) of 42 and 87? 12. There are 32 marbles in a red bag and 19 marbles in a blue bag. How many marbles need to be moved from the red bag to the blue bag, so that there will be twice as many marbles in the blue bag as in the red bag? 13. The average height of 4 students is 183 cm. The average height of another 6 students is 173 cm. What is the average height (cm) of all these 10 students? 14. A and B are two different natural numbers that are less than 24. What is the largest value that can have? 15. Two natural numbers have a sum of 22. What is the maximum product of the two numbers? |