There is a bag with only milk and dark chocolates.
The probability of randomly choosing a dark chocolate is
7
9
.
There are 42 dark chocolates in the bag and each is equally likely to be chosen.
Work out how many milk chocolates there must be.

12 milk chocolates.

Step-by-step explanation:

-We know that probabilities add upto 1:

Let X be the total number of chocolates. We know that probability is the successful events divided by the total number of events:

#We subtract the number of dark chocolates from X to get the number of milk chocolates:

Hence, there must be 12 milk chocolates.

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

step-by-step explanation: