solarisgirl

A merchant paid $300 for a shipmenet of x identical calculators. The merchant used 2 of the calculators as demonstrators and sold each of the others for $5 more than the average cost of the x calculators. If the total revenue from the sale of the calculators was $120 more than the cost of the shipment, how many calculators were in the shipment? a. 24 b. 25 c. 26 d. 28 e. 30 Of the science books in a certain supply room, 50 are on botany, 65 are on zoology, 90 are on physics. 50 are on geology, and 110 are on chemistry. If science books are removed randomly from the supply room, how many must be removed to ensure that 80 of the books removed are on the same science? (A) 81 (B) 159 © 166 (D) 285 (E) 324 a walkthrough would be much appreciated!

(0.3667)(0.8333)(0.3333)/(0.4444)(0.6667)(0.125)

I say E

Name user - that's exactly right. But how did you do it??

how do you do it?? I tried to do it this way: 144/12 = 12 then 144-24 =120 120/11 = n-3/4 but n does't come up with an integer. How did you do it and what am I doing wrong??

Each of a series of 12 projects needs 12 average days to be completed. One project, which needs 24 days, is to be replaced by another project, where the average day will become n-3/4, where n is an integer. How many days does the project require?

In an xy plane, eight points are given. If a point is selected at random, what is the probability that x+2y>10? Isn't the probability endless here??

1. At its constant rate, machine x drained off 1/2 amount of water in four hours. Then, machines x and y together drained off the remaining amount of water in three hours. How many hours will it take for y to drain off all the water, independently? 2. In the xy-plane, the graph represented by y=x^2 + px + r have how many intersects with axis- x? 1. p^2 > r 2. R^2> p 3. A polygon has angles - four of them have the same measurement, and the other angle is 80 degrees. What is the measurement of one of the other angles?

A certain junior class has 1000 students and a certain senior class has 800 students. Among these students there are 60 sibling pairs each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair? A. 4/3000 b. 1/3600 c. 9/2000 d. 1/60 e. 1/15 An unofficial explanation taken from this board reads: The way you choose a sibling out of the junior classes is 60/1000 The ways you can choose the pairing of sibling out of the senior class is 1/800. But I think it should be: The way you choose a sibling out of the junior class is 1/1000? And the senior class should be 1/800 Please correct me if I'm wrong. Or I was thinking, since it's a pair consisting of both classes, can we just calculate this 30/1000 and 30/800?

baseball caps are not allowed.

You should forget about taking any paper tests besides the ones you already have, and just concentrate on the OG and on the Power Prep. If you have any questions, search for them here, or post them up. Downloading too many exams is going to overwhelm you. Hope this helps;)

Here's the attachment in a different format.

fin3sse, Thanks a lot... your explanation helps tremendously. I knew there had to be a short cut.

A college admissions officer predicts that 20 percent of the students who are accepted will not attend the college. According to this prediction, how many students should be accepted to achieve a planned enorllment of x students? a. 1.05x b. 1.1x c. 1.2x d. 1.25x e. 1.8x

When positive integer n is divided by 3, the remainder is 2; when positive integer t is divided by 5, the remainder is 3. What is the remainder when the product nt is divided by 15? 1. n-2 is divisible by 5 2.t is divisible by 3 What is the shortcut for this type of problem? I am used to listing every number that n-2 and t can be, and then dividing their product by 15. Is there an easier way to do this without listing all the possible numbers?