Answer: he drove 156 miles
Step-by-step explanation:
Aldo rented a truck for one day. There was a base fee of $20.99. This means that the fee of $20.99 is constant.
There was an additional charge of 86 cents for each mile driven.
Converting 86 cents to dollar, it becomes 86/100 = $0.86
Aldo had to pay $155.15
when he returned the truck. This means that the sum of the base fee and the additional fee is $155.15. The additional fee paid would be the total amount paid minus the base fee. It becomes
155.15 - 20.99 = 134.16
Since there is an additional charge of 0.86 for each mile driven, number of miles for which he was charged $134.16 will be total additional fee divided by cost per mile. It becomes
134.16/0.86 = 156 miles
