Question

instructions
choose the best answer. if necessary, use the paper you were given.
question
there are 20 coins in a jar. each coin is either a nickel or a quarter. if one of the coins is selected at random, the probability of selecting a nickel is 0.6. how many quarters are in the jar?
4
8
12
20

Explanation:

Step1: Find the number of nickels

The probability of selecting a nickel is 0.6 and the total number of coins is 20. Let the number of nickels be $n$. The probability formula is $P=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$. So $n = 0.6\times20=12$.

Step2: Find the number of quarters

Let the number of quarters be $q$. We know that the total number of coins is the sum of nickels and quarters, i.e., $n + q=20$. Since $n = 12$, then $q=20 - 12 = 8$.

Answer:

8