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Total: $50,000 + $55,000 + $60,500 = $165,500

#### 35Question: A forestry engineer measures two tree diameters, one being 3.2 inches and the other 7.8 inches. What is the average diameter, in inches, of the two trees?

Solution: To find the average diameter, add the two measurements and divide by 2:

Question: Suppose that $ v $ is a positive multiple of 5. If $ v $ cubed is less than 2000, what is the greatest possible value of $ v $?

So $ k = 2 $ is the largest that satisfies the condition. Then:

The whole numbers between 4.242 and 6.928 are 5 and 6.

Solution: First, find the cost of one airplane:

Question: How many positive 5-digit numbers are divisible by 9?

Solution: A number is divisible by 9 if the sum of its digits is divisible by 9. However, for counting how many 5-digit numbers are divisible by 9, we note:

We find the number of integers divisible by 9 in this range:

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