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A car travels 150 miles in 3 hours, then 200 miles in 4 hours. What is the harmonic mean of the speeds?
A box contains 12 red, 8 blue, and 5 green balls. If 3 balls are drawn at random, what is the probability all are red?
A salary increases by 10% annually. If the initial salary is $50,000, what is the total over 3 years?
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:
