The hands on a clock (hour, minute, and second).
1. Rock & Roll
2. Mom & Pop
3. Law & Order
4. Rise & Shine
5. Rough & Tumble
There are 11.
A: Turn on the first two switches and leave them on for 5 minutes. After 5 minutes, turn off the second switch, leaving the first switch on. Now go upstairs to the attic. The light that is on is connected to the first switch. A light that is off but has a bulb that is still warm to the touch is connected to the second switch. The light that is both off and cold to the touch is connected to the third switch, which was never turned on.
Q: You have a string-like fuse that burns in exactly one minute. The fuse is inhomogeneous and it may burn slowly at first, then quickly, then slowly and so on. You have a match and no watch. How do you measure exactly 30 seconds?
A: Bend the fuse and light both ends simultaneously, the two flames will burn towards each other and meet. When they meet, it will be exactly 30 seconds.
A: Sam is “burning the midnight oil”. OIL is in the middle of NITE, so it is midNITE (or midnight) oil. Since the midnight oil is on FIRE, it is burning. To “burn the midnight oil” means to stay up working, and especially studying, late at night. This harkens back to the days when people used oil lamps at night.
A: 4.8 miles per hour. 5 is incorrect. Take any distance (say 12 miles there and 12 miles back). They take two hours to cover the first 12 miles and three hours to cover the return trip. In 5 hours, they covered 24 miles which is an overall average of 4.8 miles per hour.
Q: The Food Barn sells candy bars at a price of 5 for $1. Margaret bought $12 worth of candy bars there and resold half of them at a price of 3 for $1 and half at a price of 2 for $1. How much profit did she make assuming her labor costs are zero)?
A: $13. She bought 60 candy bars for $12. Her revenue on the 30 candy bars she sold at 3/$1 is $10; her revenue on the 30 she sold at 2/$1 is $15. Total revenue less total cost is $25 – $12, or $13.
Q: 2 fathers and 2 sons go to lunch at a cost of $7 per person. Altogether, they only pay $21. Why?
A: 1 of the sons is also a father.
Q: A woman goes into a hardware store to buy something for her house. When asked the price, the clerk replies, “the price of one is twelve cents, the price of forty-four is twenty-four cents, and the price a hundred and forty-four is thirty-six cents. What does the woman want to buy?
A: Numbers for outside her house.