There are only blue cubes, yellow cubes and green cubes in a bag. there are twice as many blue cubes as yellow cubes and four times as many green cubes as blue cubes. hannah takes at random a cube from the bag. work out the probability that hannah takes a yellow cube. ( 3 marks ) ( sorry if this question was already answered but i can't find it. sorry! > _< )

Let the yellow cubes be x

yellow = x
blue = 2x                // Blue cubes is twice of yellow
Green = 8x              // Green is four times of blue

Ratio:
Yellow : Blue : Green
   1       :   2    :     8

P(Yellow) = 1/11


The probability of getting a yellow cube is 1/11.

0.4625 or 46.25%

Step-by-step explanation:

The data for the percentage of contribution and the percentage of numbers from each suburb is presented in the table bellow:

The probability that she gets a donation is given by the sum of the probabilities of getting a donation from each suburb weighed by their respective percentage of numbers of the list:

The probability that she gets a donation is 0.4625 or 46.25%.