Algebra( Week 21 Evaluation) 1. If 10x is deducted by 8y, 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 "10 more than 8 times x"? 3. David is now 22 years old, and is 9 years older than Nancy. In how many years will David be twice as old as Nancy is now? 4. 8 years ago, Laura was 4 years older than Steve is now. If Steve's present age is X, what will be Laura's age 9 years from now? 5. Edward is 6 years younger than John. George is half as old as John is now. If George will be 13 years old 8 years from now, how old is Edward now? 6. 2 years from now, Nick will be 4 times as old as Hillary is now. If Hillary's present age is Y, what was Nick's age 2 years ago? 7. Michael is 4 times as old as Mary is now. 7 years from now, he will be 3 times as old as Mary then. How old is Mary now? 8. In a certain class, the number of students who have five letter or less in their last names is 4 times of the students who have more than five letters in their last names. If there are a total of 60 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 100π. 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, Steve will be 5 times as old as Sofia is now. If Steve's present age is Y, what will be Sofia's age 6 years from now? |