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Magoosh
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A container holds 4 quarts of alcohol and 4 quarts of water. How many quarts of water must be added to the container to create a mixture that is 3 parts alcohol to 5 parts water by volume?
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181215
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If $$\frac{1}{n(n+1)}$$ - $$\frac{1}{(n+1)(n+2)}$$ = $$\frac{2}{n(n+1)(n+2)}$$ , so $$\frac{2*9900}{3*4*5}$$+$$\frac{2*9900}{4*5*6}$$+......+$$\frac{2*9900}{98*99*100}$$=?
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OG12 OG15
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Rectangular floors X and Y have equal area. If floor X is 12 feet by 18 feet and floor Y is 9 feet wide, what is the length of floor Y in feet?
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$$\frac{1}{\frac{3}{4}-\frac{2}{3}}=$$
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PREP07 Test 2
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In the infinite sequence $$a_1$$,$$a_2$$,$$a_3$$,...,$$a_n$$,..., each term after the first is equal to twice the previous term. If $$a5-a2=12$$, what is the value of a1 ?
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OG17
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The average (arithmetic mean) score on a test taken by 10 students was x. If the average score for 5 of the students was 8, what was the average score, in terms of x, for the remaining 5 students who took the test?
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PREP07 Test 1
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 In the circle above, PQ is parallel to diameter OR, and OR has length 18. What is the length of minor arc PQ ?
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Magoosh
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Which of the following equations is true for all positive values of x and y?
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|-4| (|-20|-|5|)=
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Magoosh
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From a total of 5 boys and 4 girls, how many 4-person committees can be selected if the committee must have exactly 2 boys and 2 girls?
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Ready4
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(5^<font color='#FE8080'>4</font>)(3^5)}{90^2}= "\frac{(2^3)(5^<font color='#FE8080'>4</font>)(3^5)}{90^2}=")
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PREP07 Test 1
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If the operation △ is one of the four arithmetic operations addition, subtraction, multiplication, and division, is (6 △ 2) △ 4 = 6 △ (2 △ 4) ?(1) 3 △ 2 > 3(2) 3 △ 1 = 3
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191031
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According to the table, what is the median?
(1)4≤y≤7
(2)1≤y≤4
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Magoosh
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If k is an odd integer, which of the following must be an even integer?
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Manhattan
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What is the average of $$\frac{1}{8},\frac{3}{8},\frac{1}{2}$$ ?
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Manhattan
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Jack pours water into a bucket until the bucket is filled to 60% of its capacity. Jill then fills the bucket to capacity by pouring an additional $$\frac{2}{3}$$ of a gallon of water into the bucket. What is the capacity of the bucket, in gallons?
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A pump started filling an empty pool with water and continued at a constant rate until the pool was full. At noon the pool was $$\frac{1}{3}$$ full, and $$\frac{11}{4}$$ hours later it was $$\frac{3}{4}$$ full. What was the total number of hours that it took the pump to fill the pool?
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模考带练机经题
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$$\frac{(1+\frac{1}{2})}{(1+\frac{1}{5})}$$ = x*$$\frac{1+\frac{1}{5})}{(1+\frac{1}{2})}$$
What is the value of x?
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OG18-数学分册
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If m and n are positive integers, is m+n divisible by 4?(1) m and n are each divisible by 2.(2) Neither m nor n is divisible by 4.
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Magoosh
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$$8^{16}+16^{13}+4^{24}$$=
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