Tham khảo tài liệu 'quantitative comparisons practice phần 8', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The best answer is A. Cindy s initial weight was 50 Kg. The question is how much is 15 out of 50 in percent terms 15 X100 30 and therefore column A is greater than column B. 13. A X B 15 AI X percent of X are X 8 X 0 The best answer is B. . . . . .XX . . . Rewrite the extra data in percent terms X X - . Multiply both sides 100 8 by 100 to get X X2 X and therefore column B is greater than column A. 14. A The total decrease in the car s value B 60 AI The value of a car decreased by 20 and then it decreased by 40 more The best answer is B. Let s say the car cost 100. At first its price decreased to 80 then it decreased by 40 x 80 48 . The total decrease is 100 - 48 52 . The car decreased by 52 and not by 60 and so column B is greater. 15. A The total increase in the stock s value B 40 AI The value of a certain stock increased by 20 on January and by 20 more on February The best answer is A. Let s say that the value of the stock was 100. In January it increased to 120. In February it increased to x 120 144 . All together the stock s value increased by 44 which is greater than 40 . 16. A By how much percent are rollerblades more expansive than ice-skates B 80 AI Rollerblades cost 40 more than skateboards and skateboards cost 40 more than ice-skates The best answer is A. Let s say that ice-skates cost 100 since there are no numbers in the question. Skateboards cost 40 more thus 140. Rollerblades cost 40 more than 140 which is 196. And therefore rollerblades cost 96 more than ice-skates which is greater than 80 . 17. A The average arithmetic mean of the rest of the grasshoppers B 5 Centimeters AI The average arithmetic mean of 15 grasshoppers is 8 centimeters. The average of 5 of the grasshoppers is 10 Centimeters. The best answer B. Let s say that the average of the rest of the grasshoppers in column A is X. Use the average formula 10 5 X 3 8 50 3X 64. 2 3X 14 X 4 which is a little under 5 and therefore column B is 3 greater. 18. A The original number .
