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In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers?
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Clue
HE WAS CLEANING THE WINDOWS FROM THE INSIDE OF THE BUILDING
NONE. AN UNLISTED PHONE NUMBER DOESN'T APPEAR IN THE PHONE BOOK
IT WILL TAKE 5 DAYS FOR 100 PEOPLE TO BUILD 100 HOUSES. 1 PERSON CAN BUILD 1 HOUSE IN 5 DAYS. SO, 100 PEOPLE CAN BUILD 100 HOUSES IN 5 DAYS
PING PONG BALLS FLOAT ON WATER. SO, POUR THE WATER FROM THE WATER BOTTLE INTO THE PIPE TILL THE PING PONG BALL FLOATS TO THE SURFACE
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