Free Practice Question
PS · Problem Solving
sub-505
Probability
In a savings jar, there are a total of some 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
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Explanation
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Official Explanation
Official
Let the total number of coins be x. The probability of selecting a quarter from this jar is , which means the remaining coins represent…
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Comments
2
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M
Md.Feb 11, 2024
thankss
S
SohamJun 18, 2024
Good question
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