SAT Math Question of the Day

Math Category: Probability:

Q: Susan has 5 quarters, 3 dimes, 1 nickel, and 7 pennies in her wallet. If she randomly chooses a coin from the wallet, what is the probability that it is a quarter?

  1. 5/16
  2. 1/3
  3. 3/7
  4. 2/3
  5. 11/16

UNANSWERED.

The correct answer is A.

A: The answer is 5/16. The total number of coins in her wallet is 16 (5 quarters + 3 dimes + 1 nickel + 7 pennies). The probability of selecting a quarter is outcomes wanted / all outcomes = 5/16.