by tim Mon May 24, 2010 1:55 pm
You need to rephrase the question first:
The median is (c+d)/2
The mean is (a+b+c+d+e+f)/6
Is (c+d)/2 > (a+b+c+d+e+f)/6 ?
Multiply to clear the fractions:
Is 3c+3d > a+b+c+d+e+f, or is 2c+2d > a+b+e+f ?
(1) a + e = (3/4)(c + d)
remember that b>a and f>e, so this also gives you
b+f > 3/4(c+d)
This tells you a+b+e+f > 3/2(c+d), which doesn't help
(2) b + f = (4/3)(c + d)
remember that a<b and e<f, so this also gives you
a+e < 4/3(c+d)
This tells you a+b+e+f < 8/3(c+d), which also doesn't help
Combine them though and you get
a+b+e+f = 25/12(c+d) > 2c+2d so we have a definite NO, which means the combined information is sufficient..
Tim Sanders
Manhattan GMAT Instructor
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