Algebra( Week 21 Evaluation) 1. If 15x is deducted by 10y, 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 "6 less than 3 times x"? 3. Smith is now 23 years old, and is 7 years older than Helen. In how many years will Smith be twice as old as Helen is now? 4. 6 years ago, Jane was 3 years older than Michael is now. If Michael's present age is X, what will be Jane's age 4 years from now? 5. Kevin is 5 years younger than David. Eric is one third as old as David is now. If Eric will be 13 years old 6 years from now, how old is Kevin now? 6. 4 years from now, Ben will be 4 times as old as Emily is now. If Emily's present age is Y, what was Ben's age 5 years ago? 7. Andy is 4 times as old as Jane is now. 8 years from now, he will be 3 times as old as Jane then. How old is Jane now? 8. In a certain class, the number of students who have five letter or less in their last names is twice of the students who have more than five letters in their last names. If there are a total of 27 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 196π. 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. 4 years from now, Richard will be 4 times as old as Laura is now. If Richard's present age is Y, what will be Laura's age 6 years from now? |