type I coffee and type II coffee

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ska7945: Master | Next Rank: 500 Posts; Posts: 200; Joined: Thu Aug 07, 2008 5:14 pm; Thanked: 1 times

by ska7945 » Wed Aug 13, 2008 7:07 am

One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y. Is x < 0.8?
(1) y > 0.15
(2) C ≥ 7.30

answer B

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Source: Beat The GMAT — Data Sufficiency | Wed Aug 13, 2008 7:07 am

santa_dem: Senior | Next Rank: 100 Posts; Posts: 48; Joined: Fri Aug 08, 2008 4:44 am; Thanked: 4 times; GMAT Score:750

by santa_dem » Wed Aug 13, 2008 7:23 am

B.

6.5x+8.5y=>7.3
and
x+y=1

y=1-x

6.5x+8.5-8.5x=>7.3

2x<=1.2
x<=0.6, so definitely <0.8

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