Cluster III

Mark is in a marble shooting contest.  To distinguish his marbles from those of his opponent, he takes a bag containing only green and yellow marbles.  If Mark takes out only one of the yellow marbles for the first competition, what fractional part of the bag contains yellow marbles?

1. (Y-1)/(Y+G)
   

2. Y/(Y+G)
   

3. Y/(Y+G-1)
   

4. (Y-1)/(Y+G-1)
   

Sue works for a company that pays her $20 per hour for the first 40 hours she works.  Her rate goes up to time and a half for hours worked in excess of 40 hours.  Last week, before taxes, Sue earned $1,100.  How many hours did Sue work?

1. 45 hours
   

2. 50 hours
   

3. 55 hours
   

4. 60 hours
   

In the formula, Y = 2X + 10, what is the value of X if Y = 20?

1. 20

2. 15

3. 10

4.   5

        Here are three multiple-choice problems.  Remember to limit yourself to about two minutes for each.         

        Although the math does not require a calculator, in some cases your reasoning skills and understanding of math concepts can lead you to the correct answer with no calculating at all. 

        Mouse over and click what you believe is the correct answer.  Do this after working it out on paper if need be.  If you are correct, be sure to read the additional insights to reinforce your understanding.  If not, return to the problem and try again.

You can do this!