Answer:
I know this looks super complicated, but it is 37 students were surveyed. This is because more than one could have said they had brothers or sisters. For example:
In a batch of 10 kids,
- 3 kid could have no siblings
- 2 could have (a) sister(s)
- 2 could have (a) brother(s)
- 3 could have (a) brother(s) and (a) sister(s)
*The ( ) is for if they had 1 or more siblings*
This example isn't as specific, but that could be a reason why you got the answer wrong. If the logical answer is 67, well pff, I say what the heck? I was right. Whoever created this test/assignment is stupid.
I hope this helps!
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