Answer:
$84
Step-by-step explanation:
First, let's find the amount he earns in 1 day.
Divide the amount earned by the number of days.
amount earned/days
He earned $140 in 5 days.
$140/5 days
$28 / day
Now, find the amount he earns in 3 days.
Multiply the amount earned in one day, which is $28, by 3.
$28 * 3
$84
He earns $84 in 3 days.
