Is the number x between 0.3 and 0.6 ?
(1) 425x < 85
(2) 170x < 85
Please explain the logic ?
Thnx.
(1) 425x < 85
(2) 170x < 85
Please explain the logic ?
Thnx.
Hey Rajat,
Use benchmarks to quickly do the math:
1) 425x < 85
If x = .3
.1 * 425 = 42.5 --> 3 * 42.5 = 117.5
That's already way bigger than 85, so x has to be less than .3. You could also do this in your head, if you notice that 42.5 is 1/10th of 85, which means that .2 * 425 = 85. Thus this statement is sufficient (x is definitively not
2) 170x < 85
This is easier. If x = .5, then 170x = 85. So x can't be .5, but it can be anything smaller. That makes this statement insufficient, as x could be more or less than .3.
The answer is A.
Hope that helps!
-t
P.S. While the GMAT doesn't require a calculator, it's very helpful to be sharp with benchmarking (Finding 10%, 20%, 30%, etc. very quickly). Practice makes perfect!
