vcbabu wrote:

Someone purchase something online, cost is $5 (process fee for once purchase) plus $19.8 for each. How many articles did he purchase?

1). Total cost is 190

2). Total cost is more than 188 and less than 208

The question is flawed because 190 cannot be equal to the cost of no/none/any number of purchses.

1. Total cost = 190. This amount is not equal to the purchse cost of no number of articles however it is close to the costs of 9 articles. It should be suff because 190 cannot be equal to the costs of neither 10 articles nor 8 articles no matter how they are purchased. So the number of articles purchased has to be 9.

It should be sufff though is flawed.

2. This looks suff but actually not because there are 2 possibilities:

i. 188 < 19.8n + 5 < 208 for n is 10

or 188 < 203 < 208

ii. 188 < [(19.8n + 5) + (19.8m+5)] < 208 for n = 5 and m = 4 (there could be more number of online purchases but the number of articles purchased cannot be smaller than 9)

or 188 < 188.2 < 208.

So there could be 9 or 10 articles purchased. This is not suff.

The correct answer would be A if statement 1 were not flawed.

**Quote:**

\(188 < 19.8X + 5 < 208\)

This is not the only equation possible.

\(188 < 19.8X + 5 + 5 < 208\) is also possible.

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Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html

Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html

Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT