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This one flummoxed me A, B, C, D, E, F, G, and H are [#permalink]

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15 Nov 2006, 06:27

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This one flummoxed me

A, B, C, D, E, F, G, and H are all integers, listed in order of increasing size. When these numbers are arranged on a number line, the distance between any two consecutive numbers is constant. If G and H are equal to 5^12 and 5^13, respectively, what is the value of A?

Let x be distance between 2 pts.
We have 8 pts from A to H

Value of A = Value of H -7x ( since numbers arranged as per their value on the number line)

Value of g and h are known so we can find out x.
x = value of H - value of G =5^13 -5^12 = 4*5^12
Value of A = 5^13 -7*4*5^12 = 5^12 (5 -28) = -23 *5^12

This confused me initially because I in the stem it says the numbers are arranged according to SIZE, not value and so thought A could not be a negative number.