For lunch, every day, two of your friends, Mary and Jenn either have pizza or salad. Mary eats pizza 5 days per week and salad twice. Jenn eats pizza once a week and salad 6 times. Referring to Mary and Jenn, on a certain day, you are told that one of your friends had pizza, but they cannot tell you which friend. What is the probability that it was Mary who was seen having pizza?

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The Answer of For lunch, every day, two of your friends, Mary and Jenn either have pizza or salad. Mary eats pizza 5 days per week and salad twice. Jenn eats pizza once a week and salad 6 times. Referring to Mary and Jenn, on a certain day, you are told that one of your friends had pizza, but they cannot tell you which friend. What is the probability that it was Mary who was seen having pizza?

For Lunch, Every Day, Two of Your Friends, Mary and Jenn