Damien jogs 5 miles per day on weekdays only.  How many miles does he run over three weeks?
Three weeks at 5 days per week means Damien runs 3*5=<<3*5=15>>15 times in three weeks.
If each time he runs 5 miles, then over 15 running days he covers 5*15=<<5*15=75>>75 miles.
#### 75