proportions

Solve for x:  6/12 = x / 6

• 36
• 2
• 12
• 3

Solve for x:  x/4 = 6/8

• 4
• 2
• 3
• 10

In an animal shelter, the ratio of dogs to cats is 5 to 3. There are 25 dogs.  Write and solve a proportion to find the number c of cats.

• c=15
• c=18
• c=21
• c=16

The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?

• 480
• 1960
• 84
• 25

Courtney’s summer camp has 2 canoes for every 5 campers. If there are 70 campers in all, which proportion can be used to calculate how many canoes there are at the camp?

• 5/2 = 70/x
• 2/5 = 70/x
• 2/x = 70/5
• 2/70 = 5/x