Tham khảo tài liệu 'the sat math section 8', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THE SAT MATH SECTION 33. The probability of selecting a green marble at random from a jar that contains only green white and yellow marbles is 4. The probability of selecting a white marble at random form the same jar is 1 If this jar contains 10 yellow marbles what is the total number of marbles in the jar 34. If the operation is defined by the equation x y 2x 3y what is the value of a in the equation a 4 1 a 35. x y 22 14 10 . In the sequence above each term after the first term x is obtained by halving the term that comes before it and then adding 3 to that number. What is the value of x - y 36. If x 2x 3x 4x 1 then what is the value of x2 37. What is the least positive integer p for which 441p is the cube of an integer 38. The average of 14 scores is 80. If the average of four of these scores is 75 what is the average of the remaining 10 scores 39. If 3x - 1 9 and 4y 2 64 what is the value of y 40. If p p n 12 and p 0 what is the value of p p A p A p X X 177 THE SAT MATH SECTION Grid-In Answers 1. 158. If you are given two numbers A and B then B - A 1 is the formula for finding the quantity of items between the two numbers. Therefore 2 177 - 2 020 1 157 1. 2. 24. If the value of x is increased by 3 then the value ofy is increased by 8 X 3 24. Since after x is increased by 3 8 x 4 z the value of z - y 24. 3. 3. Find the value of x by expressing each side of the equation as a power of the same base. 28 X 24 24x 212 24x 12 4x so 3 x 4. 25. Since 33 27 and y- 1 3 27 then y- 1 3 so y 4. Thus y 1 2 4 1 2 52 25. 6. 0. Let k equal 9 then 6k 54. When 54 is divided by 3 the remainder is 0. 7. 50. After three boys are dropped from the class 25 students remain. Of those 25 44 are boys so 56 are girls. Since 56 of 25 .56 X 25 14 14 girls are enrolled in biology. Hence 14 of the 28 students in the original class were girls. Thus the number of girls in the original class comprised -2 or 50 . 8. 3 If 3x- 1 11 then 3x 12 and x 4. Since 4y 12 then y 3. Therefore x . You can grid
