Got this right by trial and error, but wanted to see algebraic solution. Thanks!
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- Gmat Prep 2 (2nd) - Basic Algebra.doc
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P + K + M = 162
given,
P = 2K ---- A
P = 1/3 M ----- B
from A and B,
2K = 1/3 M
or M = 6K
now,
2K + K +6K = 162
or K = 18
and M = 6K = 6 * 18 = 108
so M - K = 108 -18 = 90 (ANS)
