Pre-Test Question:

Chapter 4. Chapter 4 Percentages and Ratios

Math and Graphing Review
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You must read each slide, and complete any questions on the slide, in sequence.

Suppose you make lemonade with one can lemonade concentrate mixed with four cans of water. What is the fraction of the final product that is water?

A.
B.
C.
D.
Correct! The fraction of water in the final product is 4/5.
Sorry,the fraction of water in the final product is 4/5 because there are four cans of water out of a total of five (four cans water and one can concentrate).

1.

In your economics class there are 44 students. They are 20 freshmen, 12 sophomores, 8 juniors, and 4 seniors. What is the ratio of seniors to freshman?

A.
B.
C.
D.
Correct! There is one senior for every five freshmen.
Sorry,there is one senior for every five freshmen so the ratio of seniors to freshmen is 1:5.

2.

Dave bought six sodas for his friends. While walking back to their table, he tripped and spilled two. What fraction of the sodas made it safely to the table?

A.
B.
C.
D.
Correct! Dave brought four of the six sodas safely to the table.
Sorry,Dave brought four of the six sodas safely to the table, having dropped two on his way there.

3.

You go to the electronics store and they are having a sale. The laptop you are looking at is reduced in price from $1,000 to $750. If you bought the laptop, what percent of the full price would you be paying?

A.
B.
C.
D.
Correct! If you bought the laptop for $750, you would be paying 75% of the full price ($1,000).
Sorry, if you bought the laptop for $750, you would be paying 75% of the full price ($1,000).

4.

Your cat gives birth to six kittens. Three are black, two are grey, and one is white. What percentage of the kittens are black?

A.
B.
C.
D.
Correct! Half or 50% of the kittens are black.
Sorry, half or 50% of the kittens are black.

5.

Your cat gives birth to six kittens. Three are black, two are grey, and one is white. What is the ratio of black kittens to white kittens?

A.
B.
C.
D.
Correct! The ratio of black kittens to white kittens is three to one.
Sorry, the ratio of black kittens to white kittens is three to one. There are three black kittens for every white kitten.