Answer:
20 cars
40 cars
Explanation:
Arithmetic
A branch of mathematics that studies the numbers and its traditional operations like addition, subtraction, multiplication and division.
The question states Jorge washed 4 cars in the first hour, seven cars in the second hour, nine cars in the third hour and the same number of cars in the fourth hour as she did in the first 3 hours combined.
A. The number of cars washed in the first 3 hours is 4+7+9=20 cars
B. In the fourth hour he washed 20 cars, and in all four hours he washed 20+20= 40 cars