* average speed= total distance/ total time
* average speed = 2 ab /(a+b) ( when a and b are spped to cover to equal distances)
*total work done by A and B in a day ( 1/a+1/b)
*when z^3 < z^2 , z can either be negative or between 0 and 1 ...
* In equation problems in Data sufficiency , look for both positive and negative nos
For example p +q > r +s , when p > r+s and q > r +s .
The above condition is true for positive integers , but may turn out to be false for negative integers
ALL OBVIOUS DATA SUFFICIENCY PROBLEMS HAVE A CATCH
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