Answer:60 %
Step-by-step explanation:
<h3>if we set up an proportion,

=

the answer is 60. </h3><h3>100x12=1200</h3><h3>1200 divded by 20 =60</h3>
that's all , all the best
Answer:
of the 4 people that have a sister, 2 of them have a brother
Step-by-step explanation:
probability of B given A
given that the person has a sister, what is the probability they have a brother
P (B/A) = 1/2
with this venn diagram
of the 4 people that have a sister, 2 of them have a brother