There are 25 cars in a parking lot. Nine of the cars are red. The rest of the cars are black and white.

A. What percent of cars in the lot are red? Not red?
B. describe two ways to determine the percent of cars that are not black given the number of white cars.

% of cars in the lot that are red

= (9/25)*100 = 36%
% of cars in lot that are not red
= 100-36=645

A. To determine the percent of cars in the lot that are red, we need to calculate the ratio of red cars to the total number of cars and then convert it to a percentage.

1. Calculate the ratio of red cars to the total number of cars:
Red car ratio = Number of red cars / Total number of cars
= 9 cars / 25 cars

2. Convert the ratio to a percentage by multiplying it by 100:
Red car percentage = Red car ratio * 100
= (9 cars / 25 cars) * 100
= 36%

Therefore, 36% of the cars in the lot are red.

To determine the percent of cars in the lot that are not red, we can subtract the percentage of red cars from 100%:
Not red car percentage = 100% - Red car percentage
= 100% - 36%
= 64%

Thus, 64% of the cars in the lot are not red.

B. There are two ways to determine the percent of cars that are not black given the number of white cars:

Method 1:
1. Identify the number of white cars given in the question. Let's assume there are 6 white cars.

2. Calculate the number of black cars by subtracting the number of white and red cars from the total number of cars:
Number of black cars = Total number of cars - Number of red cars - Number of white cars
= 25 cars - 9 cars - 6 cars
= 10 cars

3. Calculate the ratio of non-black cars to the total number of cars:
Non-black car ratio = Number of white cars / Total number of cars
= 6 cars / 25 cars

4. Convert the ratio to a percentage by multiplying it by 100:
Non-black car percentage = Non-black car ratio * 100
= (6 cars / 25 cars) * 100
= 24%

Therefore, 24% of the cars in the lot are not black, given that there are 6 white cars.

Method 2:
1. Identify the number of white cars given in the question. Let's assume there are 6 white cars.

2. Calculate the number of black cars by subtracting the number of white cars from the total number of cars:
Number of black cars = Total number of cars - Number of white cars
= 25 cars - 6 cars
= 19 cars

3. Calculate the ratio of non-black cars to the total number of cars:
Non-black car ratio = Number of black cars / Total number of cars
= 19 cars / 25 cars

4. Convert the ratio to a percentage by multiplying it by 100:
Non-black car percentage = Non-black car ratio * 100
= (19 cars / 25 cars) * 100
= 76%

Hence, 76% of the cars in the lot are not black, given that there are 6 white cars.