Free Practice Question
PS · Problem Solving
sub-505
Probability
In a savings jar, there are a total of coins, including 48 dimes and 24 nickels. The rest of the coins are quarters. If the chance of picking a quarter from this jar is 1/3, how many quarters are present in the jar?
Answer Choices
Correct answer marked below36
Correct
B
30
C
24
D
18
E
12
See the full step-by-step explanation
You can see the correct answer above. Sign in for free to unlock the complete worked solution.
Track your performance and improve
Get detailed analytics, unlock full explanations, and move up difficulty tiers as you practice.
Explanation
Preview
Official Explanation
Official
Let the total number of coins be x. The probability of selecting a quarter is , which means the remaining coins represent…
Read the full explanation
Sign in for free to see the complete step-by-step solution to this question.
Comments
2
Sign in to join the discussion
G
GonzaloApr 7, 2024
thankss
K
khanMar 17, 2025
Thank you very much!
What this question tests
What it tests
Your ability to compute probabilities of single and compound events, including 'at least one' questions.
Common trap
Forgetting to use the complement for 'at least one', or treating dependent events as independent.
Details
Difficulty
sub-505
Type
PS
Category