A salmon has to swim 25 miles upstream. It seems 7 miles each day and drifts 5 miles at night. How many days does it take for the salmon to first reach the 25 mile mark?)
After 9 cycles he has made 18 miles
On day 10 he swims the last 7 miles.
makes good 2 miles per day
after 12 day/night cycles is at the 24 mile mark
so he will just make it at dusk on the 25 th day
Use Steve's answer
First, you would have to subtract 5 from 7. My answer is 2. Next, multiply 2 to 12. I get 24. Since 1 more day is remaining, add 1 to 24. The answer to the question is 25.
To find out how many days it takes for the salmon to reach the 25-mile mark, we need to calculate the total distance the salmon can swim each day.
During the day, the salmon swims 7 miles, and at night it drifts 5 miles. So, the salmon covers a total distance of (7 miles + 5 miles) = 12 miles per day.
Now, we can divide the total distance the salmon needs to swim (25 miles) by the distance it covers in a day (12 miles) to find the number of days it takes.
25 miles รท 12 miles/day = 2.0833 (approximately)
However, since the salmon cannot swim a fraction of a day, we can round up to the next whole number. Therefore, it would take approximately 3 days for the salmon to first reach the 25-mile mark.