How much is 70 percent of a certain number?
(1) 25 percent of twice the number is equal to half the number --> 0.25*2x = x/2 --> x can be any number. Not sufficient.
(2) 50 percent of the number is 10 less than the number --> 0.5x = x - 10 --> x = 20. Sufficient.
Answer: B.
(1) 25 percent of twice the number is equal to half the number --> 0.25*2x = x/2 --> x can be any number. Not sufficient.
(2) 50 percent of the number is 10 less than the number --> 0.5x = x - 10 --> x = 20. Sufficient.
Answer: B.
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