JAKE LOVES STEAK; TR­ISH LOVES FISH (EASY)

Reader's Digest Asia Pacific - - Brain Power -

Jake en­joys steak so much that the prob­a­bil­ity that he’ll have it for din­ner on any given evening is one in three. The favourite dish of his wife, Tr­ish, is fresh fish. The prob­a­bil­ity that she’ll have it for din­ner on any given evening is one in two. Be­cause Jake and Tr­ish al­ways dine to­gether, they’ll never have steak and fish on the same night. On av­er­age, how many times in a 30-day month will they be hav­ing ei­ther steak or fish?

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