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You're correct about the first two equations implying that N = 26. It looks they meant to say 1/5(N-1) = 1/4(N-2) - 1, but forgot to include both fractions. Was this from the official GMAT Prep software? Yes, this was from the official GMAT Prep software. I think you're right; I'm noticing a number...
- by jimmy.steve88
Wed Jun 29, 2016 2:30 pm- Forum: Data Sufficiency
- Topic: (N-1) = (N-2) - 1 is an equation with a unique solution?
- Replies: 3
- Views: 1854
(N-1) = (N-2) - 1 is an equation with a unique solution?
The answer explanation to a GMAT Prep question reads as follows: "... combining 1/5(N-1) = P - 1 and 1/4(N-2) = P, it follows that (N-1) = (N-2) - 1. This is a linear equation in N and can be solved for a unique value of N." First of all, when I combine the first two equations, I get 13/10...
- by jimmy.steve88
Wed Jun 29, 2016 8:09 am- Forum: Data Sufficiency
- Topic: (N-1) = (N-2) - 1 is an equation with a unique solution?
- Replies: 3
- Views: 1854