best approach needed for solving Y

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ifthyder: Master | Next Rank: 500 Posts; Posts: 118; Joined: Fri Apr 18, 2008 4:58 am; Thanked: 1 times

by ifthyder » Fri Sep 26, 2008 9:31 am

which time saving apprach we should use

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Source: Beat The GMAT — Problem Solving | Fri Sep 26, 2008 9:31 am

manulath: Senior | Next Rank: 100 Posts; Posts: 35; Joined: Tue Sep 09, 2008 10:12 pm; Location: Lko; Thanked: 3 times

by manulath » Fri Sep 26, 2008 9:35 am

X + Y = XY .............(MULTIPLY BOTH SIDES BT XY)

X = XY - Y = Y (X-1)

Y = X/(X-1)

ANS: A

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