# Exam Style Question

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Question id: 42. This question is similar to one that appeared in an IB Standard paper in 2014. The use of a calculator is not allowed.

### Probability

Piers wins one of the many prizes on offer in the school raffle but he does not yet know exactly what the prize is.

• The probability that a prize is something to eat is 0.3
• The probability that a prize is worth more than $10 is 0.2 • The probability that a prize is something to eat or worth more than$10 is 0.4

Find the probability that the prize Piers wins is not both something to eat and worth more than \$10 as Piers does not like expensive food.

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