18. A scale balanced with 1 blue x-block and 20 green blocks on the left side and 40 green blocks on
the right side. A student bumped into the scale
and knocked some blocks off so that only 1 blue
x-block and 3 green blocks remained on the left
side. How many blocks do you need to remove
from the right side to make the scale balance?
This is for 70 points if correct

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

ƒ = 0.03b

hope this ( :

step-by-step explanation: