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Don't over-analyze.
If x = y + a then the stem would become:
((y + a) + a)^2 = y^2
(y + 2a)^2 = y^2
Which only makes sense if a = 0 but is false for any other value. Insufficient.
- by hey_deep
Wed Feb 02, 2011 12:32 am- Forum: Data Sufficiency
- Topic: equations DS
- Replies: 30
- Views: 13175
I did not understand the wording or significance of the man on the platform. I went and did the math using some prime factorization and was pleased to see that the numbers worked out so well(!). 72 km/h = 8*9 km/h = 2^3 * 3^2 km/h Now convert km to m => 2^3 * 3^2 * 10^3 m And convert h to s => 1h * ...
- by hey_deep
Mon Jan 31, 2011 11:12 pm- Forum: Problem Solving
- Topic: What is the length of the platform in meters...............
- Replies: 46
- Views: 27589