A perfect number is one whose proper factors add up to the number. For example, 6 = 1+2+3. What's the next "perfect number"?

a. What was the last year which read the same right side up as upside down? b. What will be the next year?

This region was a kingdom of Czechoslovakia until the 15th century, when it passed to Hungary and then to the Hapsburgs. It became the core of the new state of Czechoslovakia in 1918. Today the name can refer to certain artistic intellectuals. Which regio

How would the number 70 (in base 10) be represented in base 3?

In how many different ways could a basketball player score exactly 8 points in a game? (Combinations of foul shots, 2-pointers, and 3-pointers).

A town in India has a population of 20,000 people. 5% of the inhabitants are one-legged, and half the others go barefoot. How many sandals are worn in this town?

Joe drank 1/3 of a glass of milk in one swallow, then drank 4/5 of the remaining milk in another swallow. What fraction of the original milk was left?