Answer:
Step-by-step explanation:
The answer is 7 7/8 because 5 1/4 times 1 1/2 is 7 7/8. I hope this answers your question.
Using angle bisector theroem, we have:

Solving for x, we get x=
or x=3.75
2/5 * P(2nd red) = 1/7
P(2nd Red) = 1/7 * 5/2
P(2nd Red) = 5/14 or D