Algebra( Week 21 Evaluation) 1. If 15x is deducted by 18y, 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 "9 less than 7 times x"? 3. Tom is now 19 years old, and is 10 years older than Laura. In how many years will Tom be 3 times as old as Laura is now? 4. 4 years ago, Hillary was 5 years older than David is now. If David's present age is X, what will be Hillary's age 10 years from now? 5. Rene is 4 years younger than Jay. Michael is one fourth as old as Jay is now. If Michael will be 12 years old 5 years from now, how old is Rene now? 6. 4 years from now, Ben will be 5 times as old as Jane is now. If Jane's present age is Y, what was Ben's age 7 years ago? 7. Eric is 3 times as old as Morgan is now. 6 years from now, he will be twice as old as Morgan then. How old is Morgan 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 48 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. 5 years from now, David will be 3 times as old as Niconia is now. If David's present age is Y, what will be Niconia's age 9 years from now? |