GMAT Practice Questions - GMAT Practice Question #11

Read the following GMAT practice question. Then, see if you can choose the correct multiple choice answer:

GMAT Practice Question

Hospitals across the country were surveyed for the presence of patients with two specific types of cancer. Surveyors found that 40% of the hospitals had type A cancer patients, 50% had type B cancer patients, and 20% had neither type of cancer. If one hospital from the study is chosen at random, what is the probability that it contains exactly one type of the specific cancers?

A) 0.4
B) 0.5
C) 0.6
D) 0.7
E) 0.8

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