sparky wrote:

christoph wrote:

The price of a bushel of corn is currently $3.20, and the price of a peck of wheat is $5.80. The price of corn is increasing at a constant rate of 5*x cents per day while the price of wheat is decreasing at a constant rate of squareroot2*(x) - x cents per day. What is the approximate price when a bushel of corn costs the same amount as a peck of wheat?

(A) $4.50

(B) $5.10

(C) $5.30

(D) $5.50

(E) $5.60

320 + 5x = 580 - x*2^(1/2) + x

x = 260/(4+2^(1/2))

plugging this back into equiation

my guess is E (I don't have a calculator)

why did you assume that only 1 day is involved ...i.e. prices decrease & increase for 1 day only ?

This is a nasty question or something is missing here

Assume prices become same after N days

320 + N(5x) = 580 - N(xsqrt2 - x )

N = 260 / x(4+sqrt2)

There are 2 variables and only 1 equation.

Something seems to be wrong or missing.

_________________

ash

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I'm crossing the bridge.........