Algebra( Week 21 Evaluation) 1. If 16x is deducted by 12y, and the difference is then multiplied by , which of the following is the result? 2. Which of the following is the correct representation of phrase "7 less than 4 times x"? 3. John is now 13 years old, and is 6 years older than Niconia. In how many years will John be 3 times as old as Niconia is now? 4. 5 years ago, Susan was 4 years older than David is now. If David's present age is X, what will be Susan's age 9 years from now? 5. John is 3 years younger than George. Kevin is half as old as George is now. If Kevin will be 15 years old 9 years from now, how old is John now? 6. 7 years from now, Edward will be 5 times as old as Morgan is now. If Morgan's present age is Y, what was Edward's age 5 years ago? 7. Edward is 3 times as old as Laura is now. 8 years from now, he will be twice as old as Laura then. How old is Laura now? 8. In a certain class, the number of students who have five letter or less in their last names is 5 times of the students who have more than five letters in their last names. If there are a total of 72 students, how many students are there in the class who have five letters or less in their last names? 9. There is a larger circle C with an area of 144π. You are asked to draw two circles A and B without overlapping within circle C. What is the largest possible sum of circumferences of A and B?
10. 8 years from now, Edward will be 3 times as old as Jessica is now. If Edward's present age is Y, what will be Jessica's age 6 years from now? |