Blue book Questions for tommrow exam. Please help

dvdhsu
Fri, 06 May 2011 00:13:30 +0000

First question
The table is already sorted. You don’t have to re-list everything, you can just cross one from the top, one from the bottom, and keep on going until you’re only left with one (or two, then take the average). Keep in mind that the score 95 has three people, not two.

Second question

[ul]Let r equal the number of red balloons.
[]Let g equal the number of green balloons.
[]Let b equal the number of blue balloons. [/ul]

You know that:

[ul]r=2g
[li]r=1/3[/ul] [/li]
so…

r+g= 2/6 + 1/6 = 1/2 of the whole box

Because the box only contains three colors, you know that the rest must be blue. Therefore, half of the balloons are blue.

Once you know half of the box is eighteen balloons, you simply double it to get the number of balloons in the whole box.

Third question

The distance between them is 10a + 10c, where a and c represent the distance of the woman’s steps. A = the distance of Alice’s step; C = the distance of Corine’s step.

You know that their own steps are always the same length.

Because Alice takes 17 steps to get to Corrine, and the distance hasn’t changed, you know that:

[ul]10c + 10a = 17a[/ul]

You move the 10a from the left to the right, and now you have:

[ul]10c = 7a[/ul]

Then, you isolate the a, so you have:

[ul]a = 10/7c[/ul]

I’m also taking the SAT tomorrow, first time for me. Good luck, and I hope my explanations helped!