Average Problems( Week 21 Practice) 1. The average of a list of 4 numbers was 21. After two numbers were added to the list, the average became 23. What was the average of the two numbers that were added to the list? 2. The sum of the ages of Jane and Jennifer is 14, the sum of the ages of Jane and Hillary is 17 and the sum of the ages of Jennifer and Hillary is 13. How old is Jane? 3. The average of 6 numbers is 9. Suppose 16 is added the group. What is the new average of all the numbers? 4. There are 39 marbles in a red bag and 30 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? 5. Julia's average score for the first 3 math exams is 86. The average for all 4 math exams is 87. What is the score of her last math exam? |