320 students went on a field trip to the zoo. after, they took a survey on which animal was their favorite. 25% of students chose the tigers. 30% chose the monkeys. 10% chose the sea otters. the remainder of students said 'other'. how many students chose 'other?

This is pretty simple, you just add up the percentages and that would give you 65%, now you figure out 65% of 320 and google will tell you it is 208. now you have two possible answers, i am not sure if your question is asking for a percentage or an exact amount if it is parentage the it would be 35%, if it is exact then it would be 320-208 which is 112. so your answer probably is 112 students chose other.