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A tray of cookies at a Nagpur bakery has oat cookies, coconut cookies and exactly 3 cashew cookies. The number of oat cookies is twice the number of coconut cookies, and there are 9 more oat cookies than coconut ones. One cookie is picked at random. What is the probability that it is a coconut cookie?

Class 10Probability Word ProblemsStatistics
  • A
  • B
  • C
  • D

Step-by-Step Solution

Let the coconut cookies be . Then oat = , and gives . So there are 9 coconut, 18 oat and 3 cashew cookies, i.e. 30 in all. P(coconut) = is 9 out of 27 - the 3 cashew cookies were left out of the total; answers for oat; answers for cashew.
Answer: A)

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