GRE GMAT TESTs AND SOLUTIONs

Computer Games Plus needs to get rid of its copies of an old computer game. If it lowers the cost of the old computer game by $5 dollars, it can increase sales of the old computer game by 10 units and still generate exactly $100 of revenue from the old game. How many units of the old computer game did Computer Games Plus sell after implementing the new selling strategy? A) 10 B) 15 C) 20 D) 30 E) 50

x, y, and z are consecutive positive integers such that x < y < z; which of the following must be true? I-xyz is divisible by 6 II-(z-x)(y-x+1)=4 III-xy is odd A) I only B) II only C) III only D) I and II only E) I, II, and III

At a local appliance manufacturing facility, the workers received a 20% hourly pay raise due to extraordinary performance. If one worker decided to reduce the number of hours that he worked so that his overall pay would remain unchanged, by approximately what percent would he reduce the number of hours that he worked? A) 83% B) 80% C) 20% D) 17% E) 12%