Free SAT Ratios, rates, proportional relationships, and units practice questionsdigital SAT, 2026 format
Rates, proportions, and unit conversions in a short real-world setup, where keeping the units straight is most of the work.
Answer each question, then read why the right answer is right and why the tempting one is wrong.
Question 1
A chemist has 40 liters of a solution that is 25% acid by volume. How many liters of a solution that is 75% acid must be added so that the resulting mixture is 55% acid?
Question 2
A car is traveling at a constant speed of 63 miles per hour. What is the car's speed in feet per second? (1 mile = 5280 feet)
Question 3
A car travels 210 miles in 3 hours 30 minutes. At this average speed, how many miles will the car travel in 5 hours?
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