In a Polygon,all but one vertices are connected to each other by straight lines and 78 diagonals are formed.How many sides does the polygon have ? A. 15 B.17 C.12 D.16 E.18

If Hans purchased a pair of skis and a ski jacket, what was the cost of the skis? (1) The ratio of the cost of the skis to the cost of the jacket was 5 to 1. (2) The total cost of the skis and the jacket was $360. A. Statement (1) ALONE is sufficient, [...]

If the total price of n equally priced shares of a certain stock was $12,000, what was the price per share of the stock? (1) If the price per share of the stock had been $1 more, the total price of the n shares would have been $300 more. (2) If the price per share [...]

After 5 games, a rugby team had an average of 28 points per game. In order to increase the average by n points, how many points must be scored in a 6th game? (A) n (B) 6n (C) 28n (D) 28 + n (E) 28 + 6n