Let $A$ equal the number of four digit odd numbers.  Let $B$ equal the number of four digit multiples of 5.  Find $A+B$.
Question:
Let $A$ equal the number of four digit odd numbers.  Let $B$ equal the number of four digit multiples of 5.  Find $A+B$.
Answer:
Let's think step by step.

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Let $A$ equal the number of four digit odd numbers.  Let $B$ equal the number of four digit multiples of 5.  Find $A+B$.
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