40. 115m
= An athlete trains per day
690m = total minutes of athlete’s training
d = number of days
=> 115(d) = 690
Now, the equation would be, 115 minutes per day to be multiplied by d or the
number of days to get 690minutes in all.
=> 690 / 115 = 6
=> 115 (6) = 690
d = 6
Therefore, an athlete trains 115 minutes in 6 days to get the total of 690
minutes in all.