DAY 480

GAMES Magazine

October, 1984

Ken Fischer

 

What is the arithmetic average of the first one million odd numbers?

 

 Answer:

 

1,000,000 - The average of the first n odd numbers is always n, the number of odd numbers.

 

For example, 1 + 3 + 5 = 15 (average 3)

                        1 + 3 + 5 + 7 = 16 (average 4) 

DAY 479

If .......

9 + 3 = 15

9 + 7 = 47

8 + 5 = ? 

HINT:

The + sign may or may not mean plus.

Answer:

 

8 + 5 = 27

 

Explanation:

Multiply the two given numbers, then subtract their sum:

 

9 X 3 = 27

27 - 12 = 15, etc.