Eternal_optimist, I sent you a pm...can you pm me back? Thanks.

Inequality

Please show all steps and reasoning for answer...

Q: If ab<ac, which is greater, b or c?

1) a<0

2) c<0

DS exercise

Does the following statement provide sufficient information to answer the question? Show how if it does.

Question: What was the percent increase in profits for Company X between 1991 and 1993?

Statement: The average of the annual profits of 1991 and 1993 was 12.5% higher than the profit in 1991.

I show the answer being (4/5) 5^k.

Everest, thank you for your answer. I messed up at 5^(k-1) = 5^k * 5^-1. I found the exponent rule (x^a)/(x^b) = x^(a-b) that covers doing that step.

Night reader, your answer is incorrect.

Ratios

Tom owns movies on DVD and Blue-ray in a ratio of 7:2. If he buys 6 more Blue-ray movies, the ratio would change to 11:4. How many Blue ray movies did he have to start with?

Please show steps to answer this problem.

Geometry

A paper isoceles right triangle with an area of 25 square inches is cut along a line parallel to the hypotenuse of the triangle, leaving a smaller triangle. What is the area of the new triangle if the cut was made 2 inches from the hypotenuse?

DS - ratio problem

DS Problem - What is most efficient way to solve this DS problem? Please provide step-by-step solution.

If the ratio of integers a, b, and c is 1:2:3, what is the value of a+b+c?

1) c-a = 8

2) b-a = 4

I don't understand this part: [1-(1/x)] = (x-1)/x

What did you do to [1-(1/x)] to get (x-1)/x?