1. a stable population of 35,000 birds lives on three islands. Each year 10% of the population on island A migrates to Island B, 20% of the population on island b migrates to island c, and 5% of the population on island c migrates to island a. FInd the number of birds on each of the islands of the population count on each island does not vary from f to year.
2006-11-12 05:20:06 · 2 answers · asked by big e 2 in Science & Mathematics ➔ Mathematics
x + y + z = 35.000
x = 0.9 x + 0.05 z
y = 0.1 x + 0.8 y
z = 0.95 z + 0.2 y (this equation is useless since it can be derived from the 2 previous)
So you find : z = 2 x and x = 2 y and x + y + z = 35.000
Finally
z = 20.000 ; x = 10.000 ; z = 5.000
2006-11-12 05:36:38 · answer #1 · answered by Duke_Neuro 2 · 0⤊ 0⤋
If I read this right the answer should be 35,000. The end of your question is not exactly spelled right so it is kinda hard to understand what your looking for.
2006-11-12 13:30:47 · answer #2 · answered by lpnblondie 1 · 0⤊ 1⤋