Average Problems( Week 21 Practice) 1. The average of a list of 4 numbers was 25. After two numbers were added to the list, the average became 31. What was the average of the two numbers that were added to the list? 2. The sum of the ages of Emily and Alice is 15, the sum of the ages of Emily and Anne is 16 and the sum of the ages of Alice and Anne is 17. How old is Emily? 3. The average of 7 numbers is 15. Suppose 55 is added the group. What is the new average of all the numbers? 4. There are 58 marbles in a red bag and 26 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. Sofia's average score for the first 5 math exams is 88. The average for all 6 math exams is 87. What is the score of her last math exam? |