Hi All,
We're asked for the value (0.0036)(2.8) / (0.04)(0.1)(0.003)
When dealing with lots of decimals, you might find it easiest to deal with one 'small calculation' at a time. It's worth noting that you can multiply the 'top' and 'bottom' of a fraction by the same number and the value won't change. For example, with 1/2 if you multiply the numerator and denominator by 5, you end up with 5/10 (which still equals 1/2). To remove decimals from a fraction, it's often easiest to multiply by 10 or 100 or 1000, etc.
(0.0036)(2.8) / (0.04)(0.1)(0.003)
To start, let's multiply by 1000 and rewrite the 'scariest' parts of the fraction...
(3.6)(2.8) / (0.04)(0.1)(3)
Next, let's multiply by 10....
(36)(2.8) / (0.04)(1)(3)
Finally, let's multiply by 100....
(36)(280) / (4)(1)(3) =
(36)(280) / (12) =
(3)(280) / 1 =
At this point, you can technically stop working. You know that the result will be greater than 280 and there's only one answer that 'fits'...
Final Answer: A
GMAT assassins aren't born, they're made,
Rich
