Answer:
The answer is 5$
Explanation:
If he earns 20 dollars in 1 hour, then in 1/4 of an hour he will earn:
Since 1 hour=60 minutes
He earns 20 dollars in 60 minutes
There for he will earn (20/60)=1/3 dollars in one minute
1/4 of an hour=(1/4)×60=15 minutes
To get the amount he earns in 1/4 of an hour or 15 minutes,
=(Number of minutes in 1/4 of an hour)×Amount he earns in 1 minute)=(15×1/3)=5 dollars