proportions, ratio, rate, scale factor

Solve:

• -4

• 10

• 3

• -4

A recipe called for the ratio of sugar to flour to be 10:3. If you used 50 ounces of sugar, how many ounces of flour would you use?

• 21

• 15

• 13

• 120

A car travels 50 miles in 40 minutes.

How many miles does the car travel in 20 minutes?

• 25 miles

• 60 miles

• 1.25 miles

• 70 miles

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

Find the Unit Rate of rotations per minute.
405 rotations in 5 minutes   

• 81 rotations per minute
• 73 rotations per minute
• 18 rotations per minute
• 810 rotations in 10 minutes

What is the scale factor if the triangle on the left is the original?

• 2
• 3/2
• 2/3
• 1/2

If the scale factor is less than one, the new figure will be

• an enlargement
• a reduction
• a scale factor
• bigger

If the scale factor is greater than one, the new figure will be

• a reduction
• an enlargement
• a scale
• not proportional

• 0.25
• 0.5
• 2
• 1/2

Are the two figures similar?

• Yes

• No