Read and understand given problem situations.
Develop and use the strategy: Draw a diagram.
Plan and complete alternative approaches to solving problems.
Solve real-world problems using selected strategies as part of a plan.
Answer:
6 ft
Step-by-step explanation:
Let the event 
The the probability of the events


The conditional probability

Answer:
20
Step-by-step explanation:
The answer would be 5x10^4