Su Z Doom is testing out the sound system for the concert tonight. One of the microphones has been unplugged. If she goes to test the system and first tries the mike that will not work, she will freak out and cancel her show. What is the probability that the show will go on as planned?

Express your answer as a ratio in simplest form,
using a colon to separate the numbers. Example 3:4.

Sal has forgotten which part of the tool shed he stored his chainsaw in. What is the probability that the first door he opens will have the chainsaw stored in that section?

Express your answer as a ratio in simplest form,
using a colon to separate the numbers. Example 3:4.

 art: mC