tailieunhanh - Problems practice phần 3

Tham khảo tài liệu 'problems practice phần 3', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | D 0 R 1 E -2 R 8 The best answer is A. Pick a value for Y for example Y . Input this value into the second equation 20 R 100 and therefore the only answer that includes this range is A. 15. The first number in a sequence is -8 and every term after the first is 6 more than the term preceding it. What is the value of the 102 st term A 598 B 606 C 600 D 592 E 608 The best answer is A. If the sequence started in 0 the 102 number in the sequence would simply be 101 x 6 606. Since the first number wasn t zero it was -8 the whole series of numbers is smaller by that number and therefore the answer is 606 - 8 598 . 16. In a certain class the average height is 5 feet and 2 inches. Which of the following must be true I. The tallest member in the classroom must be at least taller by an inch then the shortest member in the class. II. If there are 20 members in the class the sum of the class members heights is approximately 340 inches. III. If there is a 5 feet tall member in the class there also must be a 5 feet and 4 inches member. A None B 1 only C 2 only D 3 only E 2 and 3 The best answer is C. All the members can be the same height and so 1 doesn t have to be true. The sum is the average multiplied by the number of people and in our case The sum is 5 feet and 2 inches which is 17 inches x 20 340 inches and so this statement is good. 3 doesn t have to be true since the distribution around the average doesn t divide equally by pairs of people. We can see that only 2 is true and so C is the answer. 17. The price of a car was X pounds in February. If the price reduces by 20 each month what will the price be in May A b c D e The best answer is D. This question can be solved easier by choosing numbers. Let say that the price in February was 100 X 100 pounds . In March the price reduced by 20 to x 100 80 . In April the price reduced again by 20 to x 80 64 . In May the price reduced again by 20 to x 64 . is and .

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