Average Problems( Week 21 Practice) 1. The average of a list of 4 numbers was 28. After two numbers were added to the list, the average became 36. What was the average of the two numbers that were added to the list? 2. The sum of the ages of Nancy and Susan is 13, the sum of the ages of Nancy and Mary is 17 and the sum of the ages of Susan and Mary is 14. How old is Nancy? 3. The average of 7 numbers is 8. Suppose 16 is added the group. What is the new average of all the numbers? 4. There are 72 marbles in a red bag and 9 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. Niconia's average score for the first 4 math exams is 88. The average for all 5 math exams is 86. What is the score of her last math exam? |