Answer:
Greg exercises for 310 minutes more than the amount of time Marta exercises
Explanation:
The expressions for the total number of minutes each exercise in a month is as follows;
Total number of minutes in a month=Number of minutes per day×number of days in a month
For Marta;
Number of minutes per day=30
Number of days in a month=31 days
replacing;
Total number of minutes in a month=(30×31)=930 minutes
For Greg;
Number of minutes per day=40
Number of days in a month=31
Total number of minutes in a month=(40×31)=1,240 minutes
To get how many more minutes Greg exercises in a month than Marta;
(Total number of minutes in a month Greg exercises-Total number of minutes Marta exercises)
where;
Total number of minutes in a month Greg exercises=1,240 minutes
Total number of minutes Marta exercises=930 minutes
replacing;
(1,240-930)=310 minutes
Greg exercises for 310 minutes more than the amount of time Marta exercises