Christine randomly pulls a marble from a bowl. There are 140 marbles in the bow, of which 80 are black, 28 are green, and the rest are blue. Use words and numbers to describe the probability that she will pull a red marble out of the bowl. Remember to show your work.(2 points)
The probability of pulling a red marble out of the bowl can be calculated by finding the proportion of red marbles to the total number of marbles in the bowl.
First, we need to determine how many blue marbles are in the bowl. Since there are a total of 140 marbles and 80 are black and 28 are green, the number of blue marbles can be found by subtracting the sum of black and green marbles from the total number of marbles:
140 - (80 + 28) = 32
Therefore, there are 32 blue marbles in the bowl.
The total number of red marbles in the bowl is the remaining number after subtracting the black, green, and blue marbles from the total number of marbles:
140 - (80 + 28 + 32) = 140 - 140 = 0
Since there are no red marbles in the bowl, the probability of Christine pulling a red marble is 0.