in a class of 25 students, 15 of them have a cat 16 of them have a dog and 3 of them have neither find the probability that a student chosen at random has a cat or dog

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

What could explain what happened when the time was equal to 120 minutes