GMATBLACKBELT wrote:

ashkrs wrote:

If each term in the sum A1 + A2 + .....+ An is either 7 or 77 and the sum equals 350

,which of the following could be equal to n ?

A 38

B 39

C 40

D 41

E 42

I get C.

Took me about 1min 30 sec, but it seems to work...

Just tried values 7*38=266 +77=343 +7

So 39*7 +77=350.

Unless Im missin somethin.

no u are not missin anythin....OA is C.

but how did you arrived..on 7*38=266 +77=343 +7

i tried plugging too ..but tool hell lotta time for me to put all combinations ..before i arrived at c ..just wanted to know whats the best way to do this..