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In a survey of a city, it was found that...

In a survey of a city, it was found that 90 percent of the people in the city own a refrigerator and 15 percent own a washing machine. If everybody owns at least one appliance, what percentage owns both? `5\ p e r c e n t` b. `8\ p e r c e n t` c. `10\ p e r c e n t` d. none of these

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