Bobby, an office secretary, typed 6 letters, each of which had either 1 or 2 pages. If Bobby typed 10 pages in all, how many of the letters had 2 pages?

Solution X contains 7% (by weight) of liquid M and solution Y contains 14.5% (by weight) of liquid M. If 3 gra...

One of a circular pie has been served. If the rest of the pie is divided into n equal servings, then each of t...

In a certain country, a person is born every 5 seconds and a person dies every 13 seconds, Therefore the birth...

If x and y are positive integers, each greater than 1, and if 13(x-1)= 17(y-1), what is the least possible val...

The average of a set of 12 numbers, which includes 34, is A. If 34 is removed from the set and 38 is included...

A buzzer sounds every 15 minutes. If the buzzer sounded at 12:40 pm, which of the following could be a time at...