Answer:
20% chance.
Step-by-step explanation:
If you do not know the formula, here is a quick intuitive method.
Construct the sample space in a square with 4 divisions
split one side into 1/2 and 1/2 and the other side into
.4 and .6
You can easily see that the day that it will rain on both days is .2 (1/2*.4)
or 20%
x=21/5
5x:9 = 7:3
Turn the ratios into fractions:
5x/9 = 7/3
Then cross mutiply
15x=63
it's 3 bags 5 times 3 is 15
C is the answer your looking for
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