GRED 565 ---- Fall 2000
REVIEW PROBLEMS FOR TOPIC EXAM 2.
There will be 9 tasks (extended response mathematics questions) with multiple choice answers.
1) What percent of 40 is 12?
Solution: (12/40)x100=120/4=30%
2) What percent of 40 is 28?
Answer: 70%.
3) In the set of 60 calculators 16 are TI-81s, 29 are TI-84s and the rest are TI-92s. What
percent of the calculators is TI-92s? What is the ratio of TI-92s to the rest of the
calculators?
Answer: 25%; 1/3.
4) Kelly’s class of 30 students has 18 boys. What is the boys to girls ratio in the class?
After spring recess three girls were transferred to another school. What is the new girls to
boys ratio in Kelly’s class?
Answer: 3/2; 1/2.
5) Among 20 buttons, 6 are red. What percent of the buttons is red? What percent of the
buttons is not red?
Answer: 30%, 70%.
6) A school has students to computers ratio equal 5/2. If the number of students is 100,
how many computers are in the school? 10 new computers were purchased. Find the new
students to computers ratio? What is the new computers to students ratio?
Answer: 40 computers; 2 to 1 (or 2) ; 1 to 2 (or 1/2).
7) Among 40 students, 16 are boys? What percent of the students are boys? What percent
of the students are girls?
Answer: 40%, 60%.
8) There are 12 girls and 8 boys in Jerry’s class. What would be the probability of
drawing a boy’s name from a hat containing the names of all class members? Two girls
from the class were transferred to another school after a break. Find the probability of
drawing a boy’s name from a hat containing the names of all class members except the
two girls.
Instructor Sergei Abramovich
