How I Stopped an Alien Invasion using Proportion, November 15/09

Aliens started to arrive in our planet and their mission is to conquer earth. People's only hope are the math students who need to solve 3 questions in relation to proportions.

Question 8 (page 67)
Determine the missing value.
a)



b)

c)

d)

Question 3 (page67)
Write a proportion based on the following scenario:
Three balls cost $1.25. What is the cost of 12 balls?

answer: 12 balls cost $4.99

Question 13 (page68)
Two quarters have the same value as ten nickels. Whats is the value of five quarters in nickels?

answer: there are 25 nickels in 5 quarters.

THANKS FOR READING :)