SOLUTION: I need to put this into an algebra equation... I figured out w average the answer is 98 but no clue how to make it into algebra please help Debbie is running laps at the track. S

Question 971110: I need to put this into an algebra equation... I figured out w average the answer is 98 but no clue how to make it into algebra please help
Debbie is running laps at the track. She wants to average 100 seconds per lap on her last set of 4. For the first 3 laps, she ran 98 seconds, 103 seconds, and 101 seconds. How fast does she need to run the last lap?
Thank u!
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Debbie is running laps at the track. She wants to average 100 seconds per lap on her last set of 4. For the first 3 laps, she ran 98 seconds, 103 seconds, and 101 seconds. How fast does she need to run the last lap?
--------
(98 + 103 + 101 + time)/4 = 100
(98 + 103 + 101 + time) = 400
302 + time = 400
time = 400-302
time = 98

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