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sales are growing faster than retail sales or the economy as a whole. These findings suggest that the benefits of digital libraries to American students and persons of limited disposable income, in terms of accessibility of infor
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300难题 All trainees in a certain aviator training program must take both a written test and a flight test. If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests? 1. 10 percent of the trainees did not pass either test. 2. 20 percent of the trainees passed only the flight test.
300难题 What is the number of integers that are common to both set S and set T ? 1. The number of integers in S is 7, and the number of integers in T is 6. 2. U is the set of integers that are in S only or in T only or in both, and the number of integers in U is 10.
300难题 In the first 2 hours after Meadow's self-service laundry opens, m large washing machines and n small washing machines are in continual use. Including the time for filling and emptying the washing machines, each load of laundry takes 30 minutes in a large washing machine and 20 minutes in a small washing machine. What is the total number of loads of laundry done at Meadow 's self-service laundry during this 2-hour period? 1.n = 3m 2.2m+3n=55
300难题 Khalil drove 120 kilometers in a certain amount of time. What was his average speed, in kilometers per hour, during this time? 1.If Khalil had driven at an average speed that was 5 kilometers per hour faster, his driving time would have been reduced by 20 minutes. 2.If Khalil had driven at an average speed that was 25% faster, his driving time would have been reduced by 20%.
300难题 An investment has been growing at a fixed annual rate of 20% since it was first made; no portion of the investment has been withdrawn, and all interest has been reinvested. How much is the investment now worth? 1.The value of the investment has increased by 44% since it was first made. 2.If one year ago $600 had been withdrawn, today the investment would be worth 12% less than it is actually now worth.
300难题 Is $$x^{2}$$ - $$y^{2}$$ a positive number? 1.x - y is a positive number. 2.x+ y is a positive number.
300难题 Tami purchased several identically priced metal frames and several identically priced wooden frames for a total pretax price of $144. What was the total pretax price of the metal frames that Tami purchased? 1.The price of each metal frame was 60% greater than the price of each wooden frame. 2.Tami purchased twice as many wooden frames as metal frames.
300难题 X,81,73, 71,98, 73,64 What is the value of X in the above list of 7 numbers? 1.The average (arithmetic mean) of these 7 numbers is 80. 2.The range of these 7 numbers is 36.
300难题 If y = $$2^{x+1}$$, what is the value of y - x ? 1.$$2^{2x+2}$$=64 2.y = $$2^{2x-1}$$
300难题 If $$ x\neq 1$$, is y equal to x + 1 ? 1.$$\frac{y-2}{x-1}$$=1 2.$$y^{2}$$ = $$(x+1)^{2}$$
300难题 Of the numbers q, r, s, and t which is greatest? 1.The average (arithmetic mean) of q and r is s. 2.The sum of q and r is t.
300难题 If S is the sum of the first n positive integers, what is the value of n ? 1.S < 20 2.$$S^{2}$$ > 220
300难题 CAR RENTAL CHARGES AT THRIFTY AGENCY The table above shows the car rental charges at Thrifty Agency. The daily rate applies for each day or fraction of a day in excess of any multiple of a 7-day week, up to the charge per week. If Olga rented a car of one of the types indicated,which type was it? 1.Olga's total rental charge, based only on the rates specified, was $184. 2.Olga rented the car for 10 days.
300难题 In the figure above, if the shaded region is rectangular, what is the length of XY ? 1.The perimeter of the shaded region is 24. 2.The measure of ∠XYZ is 45° .
300难题 In the standard (x,y) coordinate plane, what is the slope of the line containing the distinct points P and Q ? 1.Both P and Q lie on the graph of |x| + |y|=1. 2.Both P and Q lie on the graph of |x + y| = 1.
300难题 In the figure above, what is the perimeter of △PQR ? 1.The length of segment PT is 2. 2.The length of segment RS is $$\sqrt{3}$$.
300难题 If the lengths of the legs of a right triangle are integers, what is the area of the triangular region? 1.The length of one leg is $$\frac{3}{4}$$ the length of the other. 2.The length of the hypotenuse is 5.
300难题 The top surface area of a square tabletop was changed so that one of the dimensions was reduced by 1 inch and the other dimension was increased by 2 inches. What was the surface area before these changes were made? 1.After the changes were made, the surface area was 70 square inches. 2.There was a 25 percent increase in one of the dimensions.