>>There are 31 books in my house. I read 2 books over the weekend. How many books are still in my house?
You still have 31 books in your house. The number of books doesn't change because you finished reading two of them; they're just no longer unread.
>>Julia has three brothers, each of them has two sisters. How many sisters does Julia have?
Julia has one sister.
Here's the logic behind this:
1. We know that Julia has three brothers. 2. Then we are told that each of her brothers has two sisters. 3. Since all four children (Julia and her brothers) share the same parents, they also share the same siblings. 4. Therefore, if each of Julia's brothers has two sisters, then there must be only one other sister besides Julia herself.
>> If you place an orange below a plate in the living room, and then move the plate to the kitchen, where is the orange now?
The orange is still in the living room, as moving the plate does not affect the location of the orange.
