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Junior | Next Rank: 30 Posts
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by mtg123 » Tue Sep 25, 2007 7:12 am
given:
a1 +a2 + ......an = 350
every term has to be either 7 or 77.

my approach:

350/7 = 50 - all ans choices are less than 50.

so there shd be atleast one term with value 77.
so 1*77 + 39*7 = 350
therefore the total num of terms = 1+39 =40
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by gmatguy16 » Tue Sep 25, 2007 10:44 am
dear guest,
this has been discussed a million times on this forum and i am sorry if you just joined this forum but
please do not post answers immediately after the question ..we accidently happen to look at the answer and after that whatever we might do is useless...thanks
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