Given:
Henry can type 3500 words in 70 minutes.
Colin can type 1500 in 30 minutes.
Brian can type 2200 words in 40 minutes.
To find:
The person who types at the fastest rate of words per minute.
Solution:
We know that,

Using this formula, we get



Since 55>50, therefore Brian's types at the fastest rate of words per minute.
Answer:
The answer is B
Step-by-step explanation:
3 to the forth power = 81
3 to the second power = 9
81/9 = 9
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Step-by-step explanation: