(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img291.imageshack.us/img291/7786/effx.jpg [Broken]

2. Relevant equations

e=1-1/(V1/V2)^(gamma-1)

3. The attempt at a solution

This is a practice test where he gives the solutions, as you can see the first thing he asks for is the efficiency, and lists the answer as 0.53. How did he get this? T1*V1^gamma-1=T2*V2^gamma-1 with t1=20 and T2=350, what am I doing wrong? (I assume this, but what am I supposed to do instead?)

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# Efficiency of an engine

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