ISEE Word Problems Question 235: Answer and Explanation
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Question: 235
15. A bag contains 7 red Skittles, 6 yellow Skittles, 4 green Skittles, and 7 blue Skittles. Natalie randomly removes 1 Skittle from the bag and eats it. Ashley then randomly removes a Skittle from the bag and eats it. If the Skittle Natalie ate was red, what is the probability that Ashley ate a blue Skittle?
- A.
- B.
- C.
- D.
Correct Answer: C
Explanation:
The answer is C
Probability is always a fraction, 
. The total number of Skittles to begin with is 24, but Natalie eats a red one, leaving 23 Skittles behind, 7 of which are blue. Ashley's probability of eating a blue one is therefore .