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18 Aug 2017, 01:50
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Is the total profit from the sales of 3 products greater than $6?
1) The least profit from the sales of the 3 products is at least $2.1
2) The 2nd largest profit from the sales of the 3 products is at least $3.1.
=> Condition 1)
Since the minimum profit of 3 products is $2.1, the total profit of them is greater than or equal to $2.1 x 3 = $6.3, which is greater than $6.
Thus this is sufficient.
Condition 2)
Since the 3nd largest profit is at least $3.1, the sum of the first and the second products is at least $6.2, which is greater than $6.
Thus this is sufficient too.
Ans: D
1) The least profit from the sales of the 3 products is at least $2.1
2) The 2nd largest profit from the sales of the 3 products is at least $3.1.
=> Condition 1)
Since the minimum profit of 3 products is $2.1, the total profit of them is greater than or equal to $2.1 x 3 = $6.3, which is greater than $6.
Thus this is sufficient.
Condition 2)
Since the 3nd largest profit is at least $3.1, the sum of the first and the second products is at least $6.2, which is greater than $6.
Thus this is sufficient too.
Ans: D
20 Aug 2017, 19:08
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If xy≠0, is |x|>|y|？
1) x=-2y
2) x=y^4
=>Condition 1)
|x| = |-2y| = 2|y| > |y|.
Thus this is sufficient.
Condition 2)
If y = 2, then x = 16 and so |x| > |y|.
If y = ½, then x = 1/16 and so |x| < |y|.
This is not sufficient.
Ans: A
1) x=-2y
2) x=y^4
=>Condition 1)
|x| = |-2y| = 2|y| > |y|.
Thus this is sufficient.
Condition 2)
If y = 2, then x = 16 and so |x| > |y|.
If y = ½, then x = 1/16 and so |x| < |y|.
This is not sufficient.
Ans: A
20 Aug 2017, 19:09
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Is a positive integer x an odd number?
1) The smallest prime factor of x is 7.
2) The greatest prime factor of x is 7.
=>Condition 1)
2 cannot be a factor of x, since the smallest prime factor of x is 7.
Condition 2)
Consider n = 2 and n =3.
Ans: A
1) The smallest prime factor of x is 7.
2) The greatest prime factor of x is 7.
=>Condition 1)
2 cannot be a factor of x, since the smallest prime factor of x is 7.
Condition 2)
Consider n = 2 and n =3.
Ans: A
