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191031
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It takes 10 hours for machine A and machine B to finish a certain job together. The working speed of A is 5 times faster than B. So how many hours does it take for A alone to do the same job?
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191031
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There are 5 numbers,and the mean is known,mean-min=6,max-mean=7,waht is the range?
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191031
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After a point moves around the circle for 300 meters, it returns to the original starting point. So which of the following could be the radius of the circle?
I. 150/π
II. 60/π
III. 15/π
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191031
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There are 5 numbers, is the range > 40?
(1)Median=70
(2)Mean=50
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191031
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X and Y are positive integers less than 56, and X-Y = 8, how many sets of X&Y are there?
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191031
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An obtuse triangle has three sides, and the length of each side is 40, 9 and x. Which of the following could be the possible value of x?
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191031
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It takes 20 minutes for Machine A, B, and C to finish a certain job together. And Machine A operating alone at its constant rate finish the same job in 240 minutes. Machine B operating alone at its constant rate finish the same job in 40 minutes. How many minutes will it take machines C alone to finish the same job?
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191031
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The sum of x and y is a prime number, is the sum of x and y odd?
(1)x is odd
(2)y>2
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