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01 Nov 2018, 03:20
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D
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Difficulty:
5%
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Question Stats:
85% (00:45) correct
15%
(01:08)
wrong
based on 219
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If \(y ≠ 0\), is \(\frac{x}{y}=\frac{1}{2}\)?
(1) x is 50 percent of y
(2) 0.1x = 0.05y
(1) x is 50 percent of y
(2) 0.1x = 0.05y
01 Nov 2018, 04:24
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If \(y ≠ 0\), is \(\frac{x}{y}=\frac{1}{2}\)?
(1) x is 50 percent of y
(2) 0.1x = 0.05y
(1) x is 50 percent of y
(2) 0.1x = 0.05y
As all we're given are equations, we'll work with them.
This is a Precise approach.
(1) so x = 0.5y meaning that x/y = 0.5 = 1/2.
Sufficient.
(2) Again, simplifying directly gives the answer. (we don't have to actually calculate!)
Sufficient.
(D)
23 Nov 2021, 07:43
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If \(y ≠ 0\), is \(\frac{x}{y}=\frac{1}{2}\)?
(1) x is 50 percent of y
(2) 0.1x = 0.05y
(1) x is 50 percent of y
(2) 0.1x = 0.05y
Target question: Is x/y = 1/2?
Statement 1: x is 50 percent of y
In other words: x = (50/100)y
Simplify: x = (1/2)y
Divide both sides of the equation by y to get: x/y = 1/2, which means the answer to the target question is YES, x/y = 1/2
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: 0.1x = 0.05y
Eliminate the decimals by multiplying both sides by 100 to get: 10x = 5y
Divide both sides by y to get: 10x/y = 5
Divide both sides by 10 to get: x/y = 5/10 = 1/2, which means the answer to the target question is YES, x/y = 1/2
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: D
