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Re: Number Properties from GMATPrep (2) [#permalink]
28 Sep 2009, 22:20

I used a less algebraic solution by backsolving/simple logic.

350 is divisible by 7 but 50 is not an option. Looking at the options you can estimate that subtractive 77 and dividing will give you something between 38 and 42.

350 – 77 = 273. 273/7 = 39.

Hence (1)77 + (39)7 = 350 Hence Ans = 40.

This may not work for more complex questions but this answer took me <1min solving this way.

Re: Number Properties from GMATPrep (2) [#permalink]
29 Sep 2009, 05:45

My approach was somewhat similar to yangsta8's.Looking at the possible answers one can see that you can only have one 77 in the sequence(since 350 -(2x77) = 196 and 196/7=28, which is not in the answer options)