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While riding her bike to the ocean and back home 77 times, Marissa timed herself at 55min55⁢min, 57min57⁢min, 55min55⁢min, 65min65⁢min, 50min50⁢min, 53min53⁢min, and 51min51⁢min. She had set a goal of averaging 5555 minutes for her rides. How many minutes will she need to spend on her eighth ride to attain her goal?

Question

While riding her bike to the ocean and back home 77 times, Marissa timed herself at 55min55⁢min, 57min57⁢min, 55min55⁢min, 65min65⁢min, 50min50⁢min, 53min53⁢min, and 51min51⁢min. She had set a goal of averaging 5555 minutes for her rides. How many minutes will she need to spend on her eighth ride to attain her goal?

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Solution

To find out how many minutes Marissa needs to spend on her eighth ride to attain her goal, we first need to find out how many minutes she has spent on her bike rides so far and how many minutes she should have spent to average 55 minutes per ride.

  1. Add up the times of her first seven rides: 55min + 57min + 55min + 65min + 50min + 53min + 51min = 386 minutes.

  2. Calculate how many minutes she should have spent to average 55 minutes per ride over eight rides: 55min/ride * 8 rides = 440 minutes.

  3. Subtract the total time spent so far from the total time she should have spent to find out how many minutes she needs to spend on her eighth ride: 440min - 386min = 54 minutes.

So, Marissa needs to spend 54 minutes on her eighth ride to attain her goal of averaging 55 minutes per ride.

This problem has been solved

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