Answer:
Rani can use the rented canoe for
hours.
Step-by-step explanation:
Given:
Rani has at most $20 to spend on a canoe rental.
To rent a canoe $12.To use the canoe cost $3 an hour.
The number of hours is 
Now, to find
the number of hours rani can use the rented canoe.
Total money Rani has at most to spend = $20.
The rent of a canoe = $12.
The cost of using canoe per hour = $3.
<em><u>According to question:</u></em>
Now, to find the number of hours rani can use the rented canoe:

<em>Subtracting both sides by 12 we get:</em>
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<em>Dividing both sides by 3 we get:</em>
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Therefore, Rani can use the rented canoe for
hours.