There are 18 boys and 12 girls in a math class. What is the ratio of girls to total students?
A. 18:30
B. 12:30
C. 30:12
D. 30:18
The total number of students is 18 + 12 = 30. The ratio of girls to total students is 12:30, which simplifies to 2:5. Therefore, the answer is not listed, but the simplified ratio is 2:5.
Mrs. Walters drove 160 miles on 5 gallons of gas. How many gallons of gas will she need to travel 256 miles?
We can start by using a proportion to solve the problem:
distance/gas = distance/gas
Plugging in the values we know:
160/5 = 256/x
To solve for x (the number of gallons needed), we can cross-multiply:
160x = 5 * 256
160x = 1280
x = 8
Therefore, Mrs. Walters will need 8 gallons of gas to travel 256 miles.
Stephen read a 90-page book in 6 days. If he continues reading at that rate, how long will it take him to read a 300-page book?
We can start by using a proportion to solve the problem:
pages/time = pages/time
Plugging in the values we know:
90/6 = 300/x
To solve for x (the time it will take to read a 300-page book), we can cross-multiply:
90x = 6 * 300
90x = 1800
x = 20
Therefore, if Stephen continues reading at the same rate, it will take him 20 days to read a 300-page book.
The distance between Milltown and Summerville is 3 inches on a map. If the map scale is 1 inch = 20 miles, what is the actual distance between the towns?
If 1 inch on the map represents 20 miles in real life, then:
3 inches on the map represents 3 x 20 = 60 miles in real life
Therefore, the actual distance between Milltown and Summerville is 60 miles.