Algebra( Week 21 Evaluation) 1. If 15x is deducted by 20y, 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 8 times x"? 3. Smith is now 18 years old, and is 10 years older than Helen. In how many years will Smith be 3 times as old as Helen is now? 4. 3 years ago, Niconia was 3 years older than Kevin is now. If Kevin's present age is X, what will be Niconia's age 6 years from now? 5. Ed is 5 years younger than Ben. Josh is one third as old as Ben is now. If Josh will be 13 years old 7 years from now, how old is Ed now? 6. 7 years from now, Josh will be 3 times as old as Morgan is now. If Morgan's present age is Y, what was Josh's age 8 years ago? 7. Smith is 4 times as old as Martha is now. 8 years from now, he will be 3 times as old as Martha then. How old is Martha now? 8. In a certain class, the number of students who have five letter or less in their last names is 3 times of the students who have more than five letters in their last names. If there are a total of 28 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. 5 years from now, Richard will be 5 times as old as Morgan is now. If Richard's present age is Y, what will be Morgan's age 10 years from now? |