what is the probability of picking a yellow marble out of a jar of 27 marbles, if 20 of the 27 marbles are green?
How many are yellow?
To find the probability of picking a yellow marble out of a jar of 27 marbles, we first need to determine how many yellow marbles there are.
Given that there are 27 marbles in total and 20 of them are green, we can subtract the number of green marbles from the total to find the number of yellow marbles.
27 total marbles - 20 green marbles = 7 yellow marbles
Therefore, there are 7 yellow marbles in the jar.
To find the probability of picking a yellow marble, we divide the number of favorable outcomes (picking a yellow marble) by the number of total outcomes (picking any marble).
The probability of picking a yellow marble out of the jar is:
Number of yellow marbles / Total number of marbles
= 7 yellow marbles / 27 total marbles
So, the probability of picking a yellow marble is 7/27, which can be simplified if needed.