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Sina’s goal is to exercise a mean of 45 minutes per day for one week. For the first 6 days of the week, she exercised 35, 40, 37, 42, 45, and 50 minutes. What is the number of minutes Sina must exercise on the 7th day of the week to reach her goal exactly?

Sagot :

let x= the remaining time to exercise on the 7th day
35+40+37+42+45+50+x = 45(7)
249+x = 315
x = 315 - 249
   = 66 mins.