From a survey of 100 college students, a marketing research company found that 60 students owned iPhones, 30 owned cars, and 25 owned both cars and iPhones.

(a) How many students owned either a car or an iPhone (but not both)?

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To find out how many students owned either a car or an iPhone (but not both), we need to subtract the number of students who owned both from the sum of students who owned either a car or an iPhone.

Let's break it down step-by-step:

1. Find the number of students who owned either a car or an iPhone:
- Number of students who owned a car: 30
- Number of students who owned an iPhone: 60
- Sum of students who owned either a car or an iPhone: 30 + 60 = 90

2. Subtract the number of students who owned both cars and iPhones from the sum obtained in step 1:
- Number of students who owned both a car and an iPhone: 25

Therefore, the number of students who owned either a car or an iPhone (but not both) is: 90 - 25 = 65.

So, 65 students owned either a car or an iPhone (but not both).

To find out how many students owned either a car or an iPhone (but not both), we can follow these steps:

1. Determine the number of students who owned either a car or an iPhone. We know that 60 students owned iPhones, 30 owned cars, and 25 owned both.

2. Subtract the number of students who owned both cars and iPhones from the total number of students who owned either a car or an iPhone. This will give us the number of students who owned either a car or an iPhone, but not both.

So, let's calculate it:

Total students who owned either a car or an iPhone = Total students who owned cars + Total students who owned iPhones - Total students who owned both cars and iPhones

Total students who owned either a car or an iPhone = 30 + 60 - 25

Total students who owned either a car or an iPhone = 65

Therefore, the number of students who owned either a car or an iPhone (but not both) is 65.