Question

A cab company calculates cab fares using the expression 1.50d + 3, where d is the distance traveled in miles. If a passenger has to pay a $21 fare for a ride, which number from the set {9, 12, 15, 18} is the value of d?

Answer 1

12

Explanation:

⇒ 21 - 3 = 18 = 1.5a

⇒ a = 12