ds yes no answer question from

princeton review ds drill 11

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If x is a positive number, is x < 1?

(1) 2x < 1

(2) 2x <= 2 (2x is less than and equal to 2)

its answer is A

its gives yes when we plug values less than 1/2 but what if we plug values like 4/5 which is .8 or 3/5 which is .6 it gives no answer so

princeton review called statement 1 sufficient despite of the fact it gives sometime positive and sometime negative value.

somebody put more light on it how is that possible ?