1. In a certain African village there live 800 women. Three per cent of them are wearing one earring. Of the other 97 per cent, half are wearing two earrings, half are wearing none. How many earrings altogether are being worn by the women?

2. A logician with some time to kill in a small town decided to have his hair cut. The town only had two barbers, each with his own shop. The logician glanced into one shop and saw that it was extremely untidy. The barber needed a shave, his clothes were unkempt, his hair was badly cut. The other shop was extremely neat. The barber was freshly shaved and spotlessly dressed, his hair neatly trimmed. The logician returned to the first shop for his haircut. Why?

3. A secretary types four letters to four people and addresses the four envelopes. If she inserts the letters at random, each in a different envelope, what is the probability that exactly three letters will go into the right envelopes?

4. If you took three apples from a basket that held 13 apples, how many apples would you have?

5. If nine thousand, nine hundred and nine pounds is written as £9,909, how should twelve thousand, twelve hundred and twelve pounds be written?

6. A chemist discovered that a certain chemical reaction took 80 minutes when he wore a tweed jacket. When he was not wearing the jacket, the same reaction always took an hour and 20 minutes. Explain.

7. A customer in a restaurant found a dead fly in his coffee. He sent the waiter back for a fresh cup. After a sip he shouted, "This is the same cup of coffee I had before!" How did he know?

8. "I guarantee," said the pet-shop salesman, "that this parrot will repeat every word it hears." A customer bought the parrot but found it would not speak a single word. Nevertheless, the salesman told the truth. Can you explain?

UNIT 7

Number & Math Play

Roman Values

What is the second to the largest number and the second to the smallest number that you can make if you have one each of the following Roman numerals?

I V L X

Time Puzzle

Two hours ago, it was as many hours after one o'clock in the afternoon as it was before one o'clock in the morning.

What time is it now?

What's Your Sign?

In the equation below, replace each question mark with one of the four mathematical signs: +,-, ×, or ÷. Each sign can be used only once. Fill in the blanks to solve the equation. (Hint: the first sign is +.)

7 ? 5 ? 4 ? 7 ? 6 = 15

Where's the Fruit Juice?

A catering company sells large containers of iced tea and large containers of fruit juice. Right now the company has six containers, each holding the following amounts:

Container A: 30 quarts

Container B: 32 quarts

Container C: 36 quarts

Container D: 38 quarts

Container E: 40 quarts

Container F: 62 quarts

Five of the containers hold iced tea, and one container holds fruit juice.

Two customers come into the shop. The first customer buys two containers of iced tea. The second customer buys twice as much tea as the first customer. Which container is holding the fruit juice?

Cats & Dogs

All of Jenny's pets are dogs except one. All of her pets are cats except one. How many cats and dogs does Jenny have?

Unit 8 Numbers Quiz

Each question below contains some numbers plus the initials of words of a clue to a well-known fact or phrase. Find the missing words that apply to the number.

Example: 7 = D in a W Answer − 7 Days in a Week

№	Number	Clue	Answer
	26	L of the E A
	7	W of the A W
	1001	AN
	13	S on the A F
	32	D F at which W F
	18	H on a G C
	90	D in a R A
	12	D of J of N
	24	H in a D
	3600	S in an H
	366	D in a L Y
	64	S on a C B
	40	D and N of the G F
	13	BD
	4	S on a V
	32	P in a C S
	66	B in the B
	11	P in a F T
	4	S of the Y
	206	B in the H B
	12	S of the Z
	10	C
	7	D S
	9	L of a C
	100	C in a M
	7	C in the R
	3	L P
	88	P K
	101	D
	52	W in a Y