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Manhattan Joe needs to paint all the airplane hangars at the airport, so he buys 360 gallons of paint to do the job. During the first week, he uses 1/4 of all the paint. During the second week, he uses 1/5 of the remaining paint. How many gallons of paint has Joe used?
Manhattan On Sunday, Bill ran 4 more miles than he ran on Saturday. Julia did not run on Saturday, but she ran twice the number of miles on Sunday that Bill ran on Sunday. If Bill and Julia ran a total of 24 miles on Saturday and Sunday, how many miles did Bill run on Sunday?
190310 A teacher graded 10 students. If the teacher added X points to the score of each student on the basis of the original one, or reduced Y points to that of each student. What was the difference between the average scores in the two cases?
1：X+Y=20
2：X-Y =4
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If xyz ≠ 0, is x9y4z5 > 0?

(1) yz < 0

(2) xz > 0
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The numbers of marbles of each of four different colors in a box are in the ratio 3 to 4 to 6 to 8. If there are 24 marbles of one of the colors, which of the following CANNOT be the total number of marbles in the box?
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There are 9 keys on a keychain, of which 5 are for exterior locks and 4 are for interior locks. How many possible selections of 5 keys from the keychain contain at least one key for an exterior lock and at least one key for an interior lock?
In a nationwide poll, N people were interviewed.If $$\frac{1}{4}$$ of them answered "yes" to question 1, and of those, $$\frac{1}{3}$$ answered "yes" to question 2, which of the following expressions represents the number of people interviewed who did not answer "yes" to both questions?
OG17 OG18 B is a boy aged 4 years 3 months whose height is 110 cm and whose weight is 19 kg. For each of the following statements, select Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select No.
190321 It takes 4 hours for three machines A,B and C to produce 10,000 masks. It takes machine A 10h to produce 10,000 masks alone. It takes machine B 8h to produce 10,000 masks alone. If C works alone, how long will it take to produce 10,000 masks?
OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022 Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?(1)y > 4(2)The cost of the 10 kilograms of material K is less than $40.
A certain dealership has a number of cars to be sold by its salespeople. How many cars are to be sold?(1) If each of the salespeople sales 4 of the cars, 23 cars will remain unsold.(2) If each of the salespeople sales 6 of the cars, 5 cars will remain unsold.
OG12 OG15 OG16 OG17 OG18 A scientist recorded the number of eggs in each of 10 birds' nests. What was the standard deviation of the numbers of eggs in the 10 nests?(1)The average (arithmetic mean) number of eggs for the 10 nests was 4.(2)Each of the 10 nests contained the same number of eggs.
PREP07 Test 2 At a two-candidate election for mayor, 3/4 of the registered voters cast ballots. How many registered voters cast ballots for the winning candidate?(1) 25,000 registered voters did not cast ballots in the election.(2) Of the registered voters who cast ballots, 55 percent cast ballots for the winning candidate.
PREP07 Test 2 Beth and Jim each received a salary increase. If Jim's salary was increased by the same percent as Beth's salary, did Bethreceive a greater dollar increase in salary than Jim?(1) Before the increases, Jim's salary was greater than $25,000.(2) Before the increases, Jim's salary was 4/5 of Beth's salary.
OG18-数学分册 A certain dealership has a number of cars to be sold by its salespeople. How many cars are to be sold?(1) If each of the salespeople sells 4 of the cars, 23 cars will remain unsold.(2) If each of the salespeople sells 6 of the cars, 5 cars will remain unsold.
190207 c is a mixture of a and b. The unit price of c is $3.2/kg. What is the value of a/b=? （The price is proportional to the unit） 1: The unit price of a is $2 / kg. 2: The unit price of b is $4 / kg.
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As many as 400 of the 1,084 patents held in Thomas Edison's name might be more justly attributed to other lesser-known inventors.
OG15 OG16 OG17 OG18 OG19 OG20 OG2022 At his regular hourly rate, Don had estimated the labor cost of a repair job as $336 and he was paid that amount. However, the job took 4 hours longer than he had estimated and, consequently, he earned $2 per hour less than his regular hourly rate. What was the time Don had estimated for the job, in hours?
PREP07 Test 2 Equal amounts of water were poured into two empty jars of different capacities, which made one jar 1/4 full and the other jar 1/3 full. If the water in the jar with the lesser capacity is then poured into the jar with the greater capacity, what fraction of the larger jar will be filled with water?
Magoosh Bea owns how many more CDs than Al owns?(1) If Bea gives 9 of her CDs to Al, then Al will own twice as many CDs as Bea owns.(2) If Bea gives 1 CD to Al, and Al purchases 4 additional CDs, then Al and Bea will have an equal number of CDs.