3.Express the ratio in lowest terms. (Enter your answer in fraction form.)

7 :42

4.Express the ratio in lowest terms. (Enter your answer in fraction form.)

4 : 5

6.About102 baby boys are born for every100 baby girls.

1. Whats the simplified ratio of males to females.

(b) What's the simplified ratio of females to males.

7.If you drive174 miles on14 1/2 gallons of gas, what is the simplified ratio of miles to gallons?

8.What is the gear ratio (rear to front) of a bicycle that has30 teeth on the rear sprocket and58 teeth on the front sprocket?

9.If welding rods cost $55 per 50 lb, how much would55 lb cost (in dollars)?

$

10.An automobile uses19 gal of fuel to go590 mi. How many gallons are required to travel850 mi? (Round your answer to one decimal place.)

? gal

11.Write the percent as a simplified fraction.

SALE40%OFF

12.Change the given form into the two missing forms.

Fraction		Decimal		Percent
3 8				%

13.Change the given form into the two missing forms. (Round your answers to three decimal places.)

Fraction		Decimal		Percent
2 3				%

14.Grades in a classroom are often given according to the percentage score obtained by the student. Suppose that a teacher grades according to the following scheme, in which all scores are rounded to the nearest percent.

A		90%100%
B		80%89%
C		65%79%
D		50%64%
F		0%49%

To determine a percent grade, form a ratio of score received to possible score, and then write the ratio as a percent. For example, if a student gets seven answers right out of a possible ten, his or her percent score is

7/10 = 70%.

Calculate the percent (nearest percent) and determine the letter grade for the following score.

Possible 100 points; earned67 points

percent :	%
letter grade :

15.An advertisement for a steel-belted radial tire states that this tire delivers17% better gas mileage. If the present gas mileage is28.5 mpg, what mileage would you expect if you purchased these tires? Round your answer to the nearest tenth of a mile per gallon.

mpg

16.A drop from60 to12 is a loss of80%; what is the percent gain from12 to60?

%

17.Find the discount of the items, given the original price and the percent markdown.

(a) $59; 25%

$

(b) $924; 35%

$